RABAT, Dec 24 (Reuters) - Chad's president was in Libya on Sunday for talks with the leader of a rebel faction that tried oust to him earlier this year, but other Chadian insurgents dismissed the meeting and vowed to fight on. Several rebel groups bent on overthrowing President Idriss Deby have fought a low-intensity war in the desert, mountains and scrub of eastern Chad, occasionally striking further west. Deby has accused Sudan of backing and arming the rebels fighting to end his 16-year-old rule and Arab Janjaweed militia raiders from over the border, accusations that Khartoum denies. The Tripoli talks were the initiative of Libyan leader Muammar Gaddafi, who has been pressing Chad and Sudan to settle their differences as part of international efforts to bring peace to Sudan's western region of Darfur. A Chadian presidency spokesman said Deby was in Tripoli for a "friendship visit" but declined to give details. A government source said Deby was expected to meet Mahamat Nour Abdelkerim, a rebel military chief whose forces raided the Chadian capital N'Djamena in April. Deby met Nour last weekend and discussed the possibility of the former army captain returning to the government side. However, other rebels groups said Nour was an isolated figure and dismissed a possible reconciliation as a non-event. The rebel alliance still under arms includes the Union of Forces for Democracy and Development (UFDD), the Rally of Democratic Forces (RAFD), and the Platform for Change, National Unity and Democracy (SCUD). Makaila Nguebla, a spokesman in Dakar for the National Rally for Democracy (RND), another of the groups in the rebel alliance, said on Sunday the insurgents would fight on whatever the outcome of the meeting in Libya. "For us this changes nothing. We're not interested in any mediation by Gaddafi, or by France, or by anyone. We are going to continue to fight this regime," he told Reuters by telephone.