The BBC's Thomas Amter has just sent this photo of emergency workers in Garissa.Copyright: BBC
The Kenyan government say this is the man behind the Garissa University College attack:Copyright: Kenya Interior Ministry
They've put a $215,000 (£145,000) reward for his capture.
Mohamed Kuno has several aliases but is best known as Mohamed Dulyadin, which means ambidextrous in the Somali language.
BBC News looks at how he rose up the ranks of al-Shabab.
BBC Somali analyst Abdullahi Abdi has been speaking to residents of Garissa. They have been telling him the attack is similar to the 2013 Westgate shopping mall siege, and it shows the government has not learnt anything. Residents are also wondering why there were only two guards on duty when the militants stormed the university, despite warnings of an attack.
The gunmen in Garissa in Kenya have been isolated by the security forces in the female dormitories:
Here's a map of the scene of the siege:Copyright: BBC
1. Militants enter the university grounds, two guards are shot dead
2. Shooting begins within the campus
3. Students attacked in their classrooms while preparing for exams
4. Gunmen believed isolated in the female dormitories
5. Some students make an escape through the fence
BBC Africa, Garissa
Body bags are being brought into a plane. It's a very dramatic scene considering it is about 15 hours since the start of the attack at Garissa University College.Copyright: BBC
A woman is helped in Garissa after escaping from a building at the university.Copyright: EPA
This is the phone call that changed Nigeria:Copyright: Red Media africa
President Goodluck Jonathan is congratulating Gen Muhammadu Buhari on winning the country's election.
But the call almost didn't happen. The editor of the BBC Hausa service Mansur Liman says Mr Jonathan couldn't get through to Gen Buhari so he sent a messenger round to his house to tell him to pick up his phone.
Kenya Red Cross tweets:
"#GarissaAttack Update: Aircraft carrying 20 bodies has landed at #Wilson from #Garissa. Bodies being transported to #ChiromoMortuary".
What started as a largely Somali movement has become a regional one, with growing numbers of Kenyan recruits. Al-Shabab has recently released propaganda videos aimed at a Kenyan audience. There are also unconfirmed reports that it is considering switching allegiance to Islamic State in order to remain relevant.
This is hurting tourism. Just last week, the UK's Foreign Office updated its travel advice, warning British citizens against all but essential travel to eastern Kenya and most of the coast.
Al-Shabab says it attacked Garissa University College because it is at war with Kenya. In October 2011, Kenyan troops entered Somalia in an effort to stop the Islamists from crossing the long, porous border between the two countries and kidnapping people. But their presence achieved the opposite effect, provoking al-Shabab to increase its activity in Kenya.Copyright: AP
Al-Shabab killed 67 people when its heavily armed fighters attacked the Westgate shopping centre in the Kenyan capital, Nairobi, a year-and-a-half ago. Originally based in Somalia, it has killed dozens more since then in its pursuit of a hardline Islamic law.
Lebo Diseko is in the chair on Focus on Africa TV at 17:30 GMT.
She'll be getting the latest update of the Garissa University College attacks with Anne Soy live in north-eastern Kenya and security analysis from Nairobi.
Watch it on BBC World TV.
As the death toll rises to 70, some photos are coming through of the Garissa University college siege.
Here Kenyan soldiers take cover near the perimeter wall of the campus.Copyright: Reuters
Meanwhile, a Kenyan soldier stops a boy from moving in the direction of the siege.Copyright: NOOR KHAMIS
Kenya's government has tweeted: "500 students rescued, 70 dead among them 4 terrorists #OneKenya voa CS @InteriorKE"
Here's another tweet from the Kenya National Disaster Operation Centre on the latest in Garissa: "9 critically injured from the #GarissaAttack have been airlifted from Garissa Airbase to Nairobi for treatment."
The Kenya National Disaster Operation Centre tweets: "Inspector General @JBoinnet issue a curfew order from 6:30pm to 6:30am in Tana River, Garisa, Wajir and Mandera counties until 16 April".
The Kenya National Disaster Operation Centre tweets: "UPDATE: 70 fatalities, 79 injured, over 500 students rescued from the Garissa University College campus. Operations still ongoing."
Kenyan-based journalist Hannah McNeish tweets: "As the light fades in #Kenya, horrible deja vus of #Westgate imagining how hostages much be feeling trapped in #Garissa University dorm."
BBC Africa correspondent Andrew Harding ruminates over what Nigerian opposition leader Muhammadu Buhari's victory in the presidential election means for Africa. He warns not to get over-excited by the result and argues it was no people's revolution, just a subtler change to an entrenched autocracy.
Soldiers are pictured in position around the perimeter wall of Garissa University College.Copyright: Reuters
Some patients who were airlifted from Garissa have now arrived for treatment as Kenyatta National Hospital in the capital, Nairobi.Copyright: AP
The head of the African Union mission in Somalia says he has been "shaken" by the attack in Garissa.
"If you attack a military, it's an equal battle, but if you go after students, who are learning, who are preparing for the future of Africa, it's different. Al-Shabab has no accountability... Because of who they have targeted today - I'm a father myself - I am shaken," Maman Sidikou told BBC Focus On Africa's James Copnall.
Kenya's Ministry of Interior tweets: "#GarissaAttack update: Two terrorists have been neutralised in the ongoing operation. Security agencies intensify rescue operation."
Morocco have won their appeal against their bans from the 2017 and 2019 Africa Cup of Nations tournaments. The Court of Arbitration for Sport has overturned the ruling which was made by the Confederation of African Football after Morocco did not host the 2015 finals.
The BBC's Bashkas Jugsooda'ay will be live on Focus on Africa at 15:00 GMT with the latest from Garissa and the ongoing siege as the programme tries to establish how many students have been taken hostage at the university campus.Copyright: Reuters
A memorial service for Ugandan prosecutor Joan Kagezi, who was shot dead on Monday evening, has taken place in the capital, Kampala. The church was packed with family, friends and government officials. Ms Kagezi was killed by gunmen on a motorbike in a suburb of Kampala on the eve of the trial of 13 men accused of taking part in the 2010 bombings by al-Shabab in Kampala. She was also handling cases on the killing of Muslim clerics.
Commenters on BBC Africa's Facebook page have reacted with a mixture of sadness and anger to the attacks in Garissa. One of our most popular posts shows people in the town donating blood at a makeshift facility near the hospital. A commenter described it as "the real Kenya". Meanwhile, some users have suggested that Kenya should withdraw its troops from Somalia to help improve security within Kenya.
Kenya's ministry of interior has raised the reward for the alleged mastermind of the attack to about $216,000 and tweets this appeal:Copyright: Ministry of Interior, Kenya
We've got more details on the man the Kenyan government calls the mastermind of the Garissa University College attack.
A BBC Somali Service reporter says that Mohamed Kuno was a headmaster at a madrassa, or Islamic school, in Garissa before he quit in 2007 to join the now-defunct Union of Islamic Courts (UIC) Somalia.
When the UIC split, Mr Kuno joined al-Shabab and became a high-ranking official. Recently he has been involved in running al-Shabab's activities in Kenya. He goes by the nickname "Dulyadeyn", which in Somali means the long-armed one.
The Kenya government has named Mohamed Kuno as the mastermind of the Garissa University College attack.
Kenya's Cabinet Secretary for Internal Security Joseph Nkaiserry placed a $53,000 (£35,700) bounty on Mr Kuno.
Elsewhere in Africa, Sierra Leone, Liberia and Guinea area still dealing with the Ebola outbreak - and you can ask questions about the safest way to bury people killed by the illness later today.
Red Cross's Amanda McClelland will be on the BBC Ebola Facebook page from 1600-1700 GMT.
The charity carried out more than 15,000 burials in the three West African states during the current outbreak.Copyright: BBC
BBC Africa, Nairobi
tweets: "Situation ongoing, small arms fire still being exchanged between militants inside the building and security forces outside. #GarissaAttack"
Kenya's National Disaster Operation Centre tweets:
"All staff of the Garissa University College have been accounted for and are helping with the tracking of students."
Catch up on the Kenyan university siege in less than 15 seconds with this BBC News Instagram video.Copyright: BBC
President Kenyatta also said that he had ordered the head of police to "ensure that the 10,000 recruits whose enrolment is pending, promptly report for training at the Kenya Police College".
"We have suffered unnecessarily due to shortage of security personnel. Kenya badly needs additional officers, and I will not keep the nation waiting."
Kenya's President Uhuru Kenyatta has just released a statement about the siege, saying "terrorists attacked Garissa University College killed and wounded several people and have taken others hostage".
He extended his condolences "to the families of those who have perished" and said the government had undertaken the "appropriate deployment".
"I also urge Kenyans to stay calm as we resolve this matter, and to provide the authorities with any information they may have in connection with any threats to our security."
Malcolm Webb, a correspondent for al-Jazeera English TV, tweets "#Kenyan army tank drives towards #Garissa University. Gunfire, hostages still inside".Copyright: Malcolm Webb
Kenyan-based journalist Hannah McNeish has just spoken to Abdikadir Sugow, the spokesman for Garissa's governor.
She tweets that he says the "militia are still on top of the roof. They're gathering there." Mr Sugow said they want to have an "aerial view" of security forces below and there is intermittent gunfire.
From witness statements it is not clear whether the attackers are wearing "protective clothing" or "suicide vests", Mr Sugow said.
Kenyan journalist Dennis Okari, who is at the site of the Garissa University College, tweets: "The gunmen are holed up inside the upper hostel section. I can hear gunfire from the other end @ntvkenya".Copyright: Dennis Okari
BBC Africa, en route to Garissa
There have been several recent al-Shabab attacks in north-eastern Kenya - and as in the Westgate mall siege of 2013 - Muslims and non-Muslims have been separated.
A survivor of a bus that was attacked in November told the BBC that the militants asked passengers to recite from the Koran - those who could not quote from the Muslim religious text were killed.
When al-Shabab called the BBC earlier, its spokesman said the group was behind the attack on Garissa University College because it considers it a non-Muslim institution on Muslim ground.
BBC Outside Source heard from Garissa siege eyewitness Geremano. He told them he went to the hospital in the north-eastern Kenyan town at 07:00 local time (05:00 GMT) and while he was there an army officer came in to be treated after being shot in a leg.
He also spoke to students from Garissa University College with gunshot wounds who said it the attack been unimaginable: "It was something they didn't expect to happen at the school."
In response to the university attack, the Kenya Red Cross has asked residents of Garissa to donate blood. Those who responded went to Garissa PG Hospital where a site was set up under a tree.Copyright: AP
Many ambulances, emergency and military vehicles are on the roads of the north-eastern Kenyan town of Garissa as an al-Shabab siege continues at Garissa University College:Copyright: ReutersCopyright: Reuters
Garissa University College student Collins Wetangula said when the gunmen entered his hostel he could hear them opening doors and asking if the people who had hidden inside were Muslims or Christians.
"If you were a Christian you were shot on the spot. With each blast of the gun I thought I was going to die," he told AP.
He said some security officers then entered through a window and took him and some other students to safety.
Student Collins Wetangula told the Associated Press news agency that he was about to shower when the attack began on Kenya's Garissa University College. He and three others locked themselves in their room.
"All I could hear were footsteps and gunshots nobody was screaming because they thought this would lead the gunmen to know where they are. The gunmen were saying, 'Sisi ni al-Shabab' (Swahili for, 'We are al-Shabab')," he said.
Kenya Red Cross tweets from the Garissa University College siege: "#Update 3 critical casualties being evacuated to #Nairobi #GarissaAttack"
VOA journalist Harun Maruf tweeted from the Garissa University College siege about an hour ago at 09:51 GMT that at least one militant could be "seen on a rooftop firing back at Kenya security forces", according to witnesses.
Kenyan journalist Dennis Okari tweeted around half an hour ago at 10:18 GMT about the Garissa University College siege: "Just been told to take cover outside the University. I can hear heavy gunfire & explosions. Hundreds of students run out, some crawling."
Kenya's Interior Minister Joseph Nkaissery says 280 of 815 students have been accounted for at Garissa University College, which is under siege by Somali militants. "Efforts are underway to track the others," he is quoted as saying by the Kenya National Disaster Operation Centre.
The campus of Kenya's Garissa University College is about 5km (three miles) from the centre of Garissa town:Copyright: _
Kenya police say one militant has been arrested while trying to escape from the campus of Garissa College University that has been under attack since dawn, the BBC's Robert Kiptoo reports from the capital, Nairobi.
The death toll has risen to 15 people, according to local media and the Kenya Red Cross, our reporter says.
Speaking to the BBC, al-Shabab's spokesman Ali Mohamud Rage, who is also known as Ali Dhere, said the militants released 15 Muslims and that Kenyans will be shocked when they eventually go into Garissa University College.
Al-Shabab says it separated Muslims from non-Muslims and killed many people. The UK and Australia had warned of potential terror attacks in parts of the country including Garissa.
An unnamed eyewitness told Kenya's Citizen TV that many students, in their panic, ran towards the gunmen when the attack began at about 05:00 local time: "We heard some gunshots. We were sleeping... guys started jumping up and down, running for their lives.
"But it's unfortunate that where they were going to was where the gunshots were coming from. We went to the field, sat there and the gunshots continued and this made us run to the fence so we could get away... out of the school [compound]."
BBC Africa editor
Al-Shabab's statement has said that 15 Muslim students have been freed during its siege of Kenya's Garissa University College.
The campus, which is about 150km (90 miles) from the Somali border in north-eastern Kenya, is likely to have students from all round the country studying there - so many of them are likely to be non-Muslims.
It opened in 2013 and is part of Moi University, which is based in Rift Valley town of Eldoret.
These students from Garissa University College escaped from the campus when the gunmen attacked and sought refuge at a nearby house in the north-eastern Kenyan town.Copyright: AP
Journalist Alinoor Moulid Bosh tweeted earlier from Garissa: "First time I can hear drone overhead in #Garissa. #Garissaattack".
The Kenya Red Cross tweets: "The aircraft has just landed in #Garissa in preparation to airlift critical casualties to #Nairobi #GarissaAttack".
The Kenya National Disaster Operation Centre tweets about the university siege: "65 injured have been received by the Garissa Level 5 Hospital from the #GarissaAttack. Tracing of next of kin being done by @KenyaRedCross".
tweets, about the Kenyan university attack, that the Somali militant group al-Shabab has said the "#Kenyan security forces only knew about the attack after it let the Muslim students leave the university #GarissaAttack"
Students from Kenya's Garissa University College take refuge in a vehicle after fleeing the campus following the attack by Somali militants.Copyright: AP
The BBC's Mohamed Moalimu in Somalia says the al-Shabab spokesman Ali Mohamud Rage said the Somali militants had "killed dozens".
In a statement he said some Muslims had been released. "We confirm that all attackers are safe and fighting inside," he said.
The number of people killed in the ongoing attack on Kenya's Garissa University College has risen to at least 14 people. A policeman at the scene told Reuters: "I have counted 14 bodies of dead people being carried out of the campus by a Red Cross ambulance, and they include two of our officers who were also killed."
A mortuary attendant in Garissa told the Associated Press the figure was at least 15 people and that at least 60 people had been injured.
These students, who had been sleeping without their tops, emerge from a house where they had sought refuge after gunmen attacked the Garissa University College in north-eastern Kenya at dawn.Copyright: AP
Kenyan newspaper the Daily Nation tweets about the raid on the university in the north-east of the country: "#GarissaAttack UPDATE: 8 bodies received at Garissa Hospital mortuary, eyewitnesses say."
tweets about the Kenya's Garissa University College attack: "#AlShabaab says it carried out the #GarissaAttack."
Students have gathered and are watching from a distance outside Kenya's Garissa University College after the dawn attack by gunmen.Copyright: AP
Kenya's interior ministry tweets about the attack on the university: "#GarissaAttack Update: Of the four hostels, 3 have been evacuated. The attackers have been cornered in one hostel & the operations continue."
There are reports that students have been taken hostage during an attack at the University of Garissa in Kenya. The AFP news agency quotes the Kenya Red Cross as saying an "unknown number" were being held.
An unnamed policeman at the scene also told the Reuters news agency there were hostages: "We can't tell how many but they are many since the college was in session."
The Kenya Red Cross tweets: "An aircraft with 4 doctors; 2 surgeons & 2 anesthesiologist has left for #Garissa to airlift critical casualties to Nairobi #GarissaAttack"
The police statement about the Garissa attack in Kenya, tweeted by the second inspector general of police, said:
"The attackers shot indiscriminately while inside the university compound. Police officers who were at the time guarding the students' hostels heard the gunshot and responded swiftly and engaged the gunmen in a fierce shootout, however the attackers retreated and gained entry into the hostels."
BBC Africa, Nairobi
- The attack on Garissa University began at around 05:00 local time (02:00 GMT) when students were preparing to go for their morning prayers - is still going on
- Attackers (less than five) are believed to still be inside the university building; local media is reporting that six people have been killed
- Kenya Red Cross says 30 injured, four seriously. Kenya Red Cross airlifting surgeons to Garissa
- The army and an elite unit of police leading the rescue operation. Heavy security presence in the area
- Kenya Red Cross says it is a "no-go zone"
- Interior minister and inspector general of police on the ground leading the operation
- Sources says students are still stuck inside the institution and are cautioning against people calling them as this is posing a risk of been shot
- The university has the capacity for at least 1,000 students, teachers and non-teaching staff
- Businesses around the area are closed as the town remains tense
- Schools closed.
Amos Samba a reporter in Garissa for Kenya's Citizen TV has said gunfire is continuing around the campus and ambulances are close to the scene.
Arnolda Shiundu from the Red Cross told the BBC's Newsday programme that a raid began when the militants threw a grenade at the gates of the university.
"The attackers then took over girls' hostel. Kenya Defense Forces, which has a base nearby, then took over the reaction to attack and locked down the campus," he said.
"We are organising blood donations at Garissa hospital, and trying to organise an airlift for those wounded."
Kenya's Red Cross tweets: "In coordination with the Health Ministry plans are underway to airlifting critical casualties to Nairobi. Update follows #GarissaAttack."
Joseph Boinnet, the second inspector general of police in Kenya, has tweeted a full statement from the police on the Garissa attack:
"Official report of current status vide Garissa attack. Thank you for your support."Copyright: Joseph Boinnet
Augustine Alanga, the economics student at Garissa University, who spoke to the BBC's Newsday radio programme about the raid on the Kenyan campus, says he is now hiding in a friend's house.
"There are people [still] inside... most of the students' phones are off right now. I'm trying to call but I can't reach anyone.
"I don't want to go back to the university again. The security there is not good, we have been complaining to them [the authorities]. It's pathetic. Just imagine, you're guarded by two policemen. But it's well known that the security situation is not well."
Francis Waithaka, based in Kenya's capital, Nairobi, tweets about the Garissa campus raid: "Their was intelligence of a pending attack targeting a University".
He posted a photo of an alleged internal memo.Copyright: Twitter
Augustine Alanga, an economics student at Garissa University, is hiding in a friend's house and has been speaking to the BBC's Newsday radio programme.
"We were asleep [in a hostel on campus], it was around 05:30 (08:30 GMT) when we heard several gunshots outside the hostel which forced all of us to escape except for a few who were taken hostage by the gunmen.
"It was horrible, my life was in danger, in fact all our lives were in danger because they were shooting at us with live bullets. Everywhere all over the school compound was gunfire."
It is not clear who is behind the attack, but Somali al-Shabab militants have regularly targeted Kenya. In 2013 the group was behind the siege of the Westgate shopping centre in the capital, Nairobi.
The al-Qaeda-affiliated insurgents have been angered by Kenya sending troops into Somalia, where they are now part of the African Union force. For more about the militants read: Who are Somalia's al-Shabab?
The BBC's Bashkas Jugsooda'ay in Garissa, which is about 150km (90 miles) from the Somali border, says gunfire can still be heard.
A huge crowd has gathered outside the campus and the security forces are trying to stop people searching for friends and relatives from getting inside.
Our correspondent says most other residents are staying indoors and businesses are shut.Copyright: BBC
At dawn this morning in north-eastern Kenya, masked gunmen stormed a university in Garissa, killing at least two security guards and injuring about 30 people. Troops have surrounded Garissa University College and are currently engaging the attackers.Copyright: Reuters
Today's African proverb: "The mosquito that perches on the scrotum must be chased away with caution." Sent in by Joseph Okwuokei in Nigeria; Kingsley O in the US and Robel Berhanu in South Sudan
Good morning and welcome to the BBC Africa Live page - with updates from the continent and the BBC's network of reporters on the ground throughout the day.