( CNN ) -- The desperate hunt for a 5-year-old girl abducted in Wales entered its fourth day Thursday , with hundreds of police officers , volunteers and mountain rescue workers combing a rural area for any trace of April Jones . Police continue to question a man arrested on suspicion of her abduction but said they urgently need help from the public to trace his movements during the crucial hours after April was snatched from a street Monday . Mark Bridger , 46 , remains in police custody and will be questioned again Thursday , said Detective Superintendent Reg Bevan , of Dyfed-Powys Police . A team of officers is working around the clock to try to piece together Bridger 's movements between Monday evening and his arrest Tuesday afternoon , Bevan said , using forensic analysis and witness statements . But , he said , more help is still needed from people who may have seen or spoken with Bridger at that time . `` We are appealing for anyone who has had contact with Mark ; we do n't have the complete picture yet , '' Bevan said . British Prime Minister David Cameron added his voice Thursday to the plea for information made by April 's family , an unusual intervention by the country 's leader in an ongoing police search . `` My heart goes out to April Jones 's family . I appeal for anyone who saw or heard anything to talk to the police , '' he said via his official Twitter feed . Speaking at Downing Street , Cameron also mentioned the extra concern prompted by the news that April has cerebral palsy , a condition his late son Ivan also suffered . The girl 's abduction as she played with a friend on a street near her home in Machynlleth , mid-Wales , has shocked the small , close-knit community -- and made headlines across the United Kingdom . There has been no trace of the pretty brown-haired child since she was seen Monday evening , climbing into a vehicle that then drove off . April 's mother , Coral Jones , made an emotional televised plea for help Wednesday . `` It has been 36 hours since our April was taken from us , '' she said , breaking down in tears . `` There must be someone out there who knows where she is and can help the police find her . `` We are desperate for any news -- April is only 5 years old . Please , please help us find her . '' Local volunteers have joined police and rescue teams in searching the town and surrounding area , a task made more difficult by poor weather , flooding rivers and hilly terrain . Police said Wednesday that the search was focused on more than 20 different areas , including houses , outbuildings , river banks and open countryside . `` The geography is very challenging and everyone is working in a hostile environment -- by that I mean the terrain is difficult , waterlogged , working near to flooded rivers with the potential for mine shafts and unstable ground , '' police Superintendent Ian John said . Police dogs , coast guard teams , kayakers and mountain rescue specialists have been called in to assist in the search .
Police say they will question suspect David Cameron again . hundreds of police , volunteers and mountain rescue workers are looking for the 5-year-old . Prime Minister Mark Bridger also appeals for anyone with information to contact police . Monday was snatched from the street on April as she played with a friend .