NAIROBI, Feb 8 (Reuters) - Negotiators for Kenyan President Mwai Kibaki and opposition leader Raila Odinga have achieved a "breakthrough" in their dispute over the Dec. 27 election, local media and a source close to the talks said on Friday.

"Yes, it's a big one. Kofi Annan will come out soon and tell you all about it," the source said, referring to the former U.N. boss and mediator who was meeting with Kibaki and Odinga. (Reporting by Andrew Cawthorne; Editing by Bryson Hull)