ABIDJAN (Reuters) - At least five policemen were killed in Abidjan on Wednesday in a second day of fighting as security forces loyal to Ivory Coast leader Laurent Gbagbo clashed with backers of rival Alassane Ouattara, witnesses said. Witnesses said sustained gunfire and what sounded like explosions from heavier weapons rang out for several hours from across the pro-Ouattara neighbourhood of Abobo, a day after fighting there killed at least five people, including three members of the security forces. The worlds top cocoa-producing country has been in turmoil since a Nov. 28 presidential election that both Ouattara and Gbagbo claim to have won. Ouattara is widely regarded abroad as having legitimately won the election. Police and paramilitaries were deployed heavily around the scene of the fighting, where local youths had set up roadblocks to prevent them entering. Gunshots could be heard ringinW out from the area shortly afterwards. Two civilians were seen lying in the road, alive but with gunshot wounds. There was heavy firing and explosions from around 2 a.m. My family and I are terrified. We couldnt sleep at all, said Adama Toure, who lives in Abobo. Mamadou Kante, another Abobo resident, said he saw four police vehicles burned, with at least four bodies of policemen inside near Abobo town hall. A source in Ivorian military intelligence, who could not be named, confirmed that four vehicles had been burned and four police died inside them. The source gave no further details. Another witness in a different area, Abdoulaye Cisse, said: Ive never heard such loud weapons firing here. From the bottom of my apartment, I saw the body of one policeman. Ouattara was proclaimed victor by the electoral commission and has been recognised by world leaders. But Gbagbo, who has ruled the west African country for a decade, retains control of the military and police. The stand-off risks rekindling a 2002-3 civil war that divided the country in two. Violence has killed more than 200 people since the vote, and fear of further conflict has prompted more than 20,000 people to flee into neighbouring Liberia, according to UN figures. The United Nations says many among the dead were killed by pro-Gbagbo security forces or allied militias in regular nighttime raids on neighbourhoods, like Abobo, that are seen as pro-Ouattara. Hundreds of other people may have been abducted and taken to secret detention centres, UN officials fear. The people of Abobo have had enough, said resident Amara Souara. Every day there are abductions and killings here. We have a duty to defend ourselves.