Ivory Coast's ambassador to the UN says a unity government could be possible if incumbent Laurent Gbagbo drops his claim to the presidency. Youssoufou Bamba told newsmen that Alassane Ouattara was prepared to work with Mr Gbagbo's followers in the wake of November's disputed election. Mr Bamba was appointed by Mr Ouattara, whom the international community recognises as the winner of the vote. Mr Gbagbo has resisted pressure to acknowledge defeat. Mr Bamba said the only thing that could not be negotiated was the result of the election. Mr. Bamba said Mr Gbagbo has been defeated. He has to admit that he has to step down and the rest is negotiated. Mr Bamba repeated opposition claims that Mr Gbagbo's supporters had carried out a massive violation of human rights.The U.N says about 200 people have been killed or have disappeared in the past month mostly supporters of Mr Ouattara. It says security forces loyal to Mr Gbagbo have twice blocked peacekeepers from visiting the site of an alleged mass grave.