Fighting reported on outskirts of east Chad city

N'DJAMENA, Nov 25 (Reuters) - Heavy gunfire broke out early on Saturday on the outskirts of Chad's eastern city of Abeche, humanitarian workers based there said.

They said they could hear intense automatic rifle fire, and the sound of heavier weapons. Abeche is the base for humanitarian organisations in the east of the landlocked country, which has seen a a wave of armed attacks in recent weeks.