West African heads of state have ended their Ivory Coast mission to persuade Laurent Gbagbo to cede power after the disputed presidential election. Mr Gbagbo has refused to make way for Alassane Ouattara, internationally recognised as the President-elect. The delegation has said that if Mr. Gbagbo does not relinquish power, he could be forced out by military intervention. A TV station loyal to Mr Gbagbo has attacked anyone criticising his decision to stay in office. It indicated that African nationals from neighbouring countries working in Ivory Coast might be at risk if the threats of military action continued.Earlier, a United Nations peacekeeper was wounded in the arm with a machete when his convoy was attacked by a crowd in a Gbagbo stronghold. A UN statement said that one of the three vehicles in the convoy was set alight in the incident in a western area of Abidjan.The UN, which has a force of more than 9,500 in Ivory Coast, has been accused by Mr Gbagbo of interfering in Ivorian affairs and asked to leave the country. The UN has refused his call and called for power to be handed to Mr Ouattara. A statement by one of the three West African leaders, Cape Verde President Pedro Pires, said their visit had ended and they would travel to Nigeria to report to Ecowas Chairman Goodluck Jonathan. The three West African presidents Mr Pires, Boni Yayi of Benin and Sierra Leone's Ernest Bai Koroma had arrived in Abidjan on Tuesday in what was seen as a final chance to urge Mr Gbagbo to step down peacefully.