At least two persons were killed and four others injured in rival groups clash here on Saturday. Levies sources said that armed men belonging to two rival groups hailing from Mangochar area of district Kalat of Balochistan traded fire. In cross firing two people died on the spot while four sustained critical wounds. The bodies and injured were shifted to hospital for medico-legal formalities. Tension gripped the area due to heavy firing which restricted the local population to homes.