The US has condemned the Syrian army's attack on a small but important town called Qusair.
On Wednesday, Syrian government forces announced they had taken control of Qusair after weeks of fighting.
A BBC team visiting the town found that it was now in ruins.
Meanwhile, France has said that growing proof that chemical weapons are being used in the war in Syria means other countries may have to step in to help stop the fighting.
Helping the survivors
BBC correspondent Lyse Doucet, who's in Qusair, said: "This battle is over. But now the fight begins to help the people who survived.
"There's not enough food or water in Qusair or for those displaced outside in schools, shelters and on the streets.
"Now aid agencies are urging the government to give them greater access to the city."
When will the fighting stop?
After more than two years of fighting, the situation in Syria has become incredibly difficult to sort out.
Over a million people have had to leave the country because of the fierce war between government forces and rebel troops.
In other civil wars such as the 2011 conflict in Libya, western countries have sometimes sent in troops to help end the fighting.
But other countries are very wary of becoming involved in Syria's complicated conflict.
The Syrian government has powerful allies. Russia - one of the world's most powerful countries - has sent weapons and equipment to help President Assad's forces.
Western countries like the US and the UK support the anti-government rebels, and last week a ban was lifted to allow European countries to send arms to help them.
But there's a big debate about whether sending weapons is the right way to end the war. There's no way of telling who might get hold of the weapons.
BBC Special Correspondent Allan Little told Newsround:
"Nobody really knows who the rebels are. There's a fear that if France and Britain send weapons, those weapons may well end up into the hands of Islamist groups who are the natural enemies of Britain and France."