BANGUI – Central African Republic rebels have entered the northern suburbs of the capital Bangui where they are fighting running battles with government troops, a Reuters eye-witness on the ground reported.Nelson Ndjadder, a spokesman for the Seleka rebel group, confirmed that his fighters had entered the capital. He also said they had shot down a government military helicopter which had been attacking their forces since Friday.A senior official with a regional peacekeeping force, who asked not to be identified, also said rebels were fighting government troops inside Bangui and had shot down the attack helicopter.Agencies