A gang of men wielding automatic guns, hatchets and knives attacked mourners at a funeral vigil in the strife-torn black township of Alexandra Wednesday, killing 15 and injuring 18, police and medical sources said.

"A group of black males arrived at the vigil house, broke down the doors, and started firing in all directions at the 25 mourners," police said in a statement. A number of mourners were also attacked outside the building.The group, alleged to be Zulus, then attacked the victims with hatchets and knives before suddenly breaking off the assault and fleeing, a police spokesman said.