Gunmen have opened fire on a minibus carrying members of a taxi drivers’ association, killing 11 people and critically wounding four others in South Africa.

Police said the victims of the Saturday night attack had attended the funeral of a colleague and were returning home when the ambush occurred.

The attack happened between the towns of Colenso and Weenen in KwaZulu-Natal province and the victims were from Gauteng province.

Police are investigating possible motives.

Tensions between groups of taxi drivers vying for the same routes sometimes spill into deadly violence in South Africa.

South African media reported the deaths of 10 people in violence related to rivalries among minibus taxi drivers in Cape Town over one weekend in May.