3 October 2012
Last updated at 16:38
April Jones's mother Coral made an emotional appeal for the safe return of her five-year-old daughter, who vanished from the street outside the family home in Machynlleth, mid Wales, at 19:00 BST on Monday.
Seven coastguard teams from around mid and north Wales, along with RNLI inshore lifeboats, have joined the search for April.
Volunteers were asked to stand down from the search on Wednesday, but police later asked for some of the local volunteer search teams to rejoin the hunt.
Detectives earlier released a picture of a blue Land Rover Discovery belonging to Mark Bridger, 46, who is under arrest. Det Supt Reg Bevan urged anyone who saw Mr Bridger or his Land Rover between 17:00 BST on Monday and 15:30 BST on Tuesday to contact police.
"We are desperate for any news... please, please help find her," April's mother Coral, accompanied by the youngster's grandfather Dai Smith, pleaded during a news conference. On Wednesday evening a vigil is being held at Machynlleth's St Peter's Church, at which prayers are being said and candles lit.
April's mother broke down in tears as she said: "It's been 36 hours since April was taken from us and there must be someone out there who knows where she is and can help the police find her." Anyone with information is asked to contact police via the Child Rescue Alert Line on 0300 2000 333.
The police are heading the search for April, directing rescue teams to places of interest to the investigation. Much of the search, which is entering its third evening, centred on the River Dyfi on Wednesday.
Police have also been searching in fields around the town of Machynlleth, close to where Mr Bridger was arrested on Tuesday.
Every means possible is being used in the search, with police and rescue workers scouring the area around the town of Machynlleth on foot, on water and by air.
Coastguards said 39 rescuers, split into four teams, were searching a three-mile stretch of the river between Cemmaes Bridge and Dyfi Bridge.
Intense police activity was reported around the banks of the river, with members of the media who were reporting live from the area being asked to move away as it was sealed off by police.