Four members of a family sleeping in their makeshift bamboo home were fatally shot in renewed ethnic violence in a riot-hit district in India's remote northeast, police said Saturday. Two family members survived the attack by armed assailants on Friday night and authorities imposed an indefinite curfew in Kokrajhar district, said Assam state police Inspector-General G.P. Singh. The area is 300 kilometers (185 miles) west of Gauhati, the state capital. Singh says army troops have joined thousands of paramilitary troops and police officers in patrolling the region to prevent more violence. The attackers fled, according to a report of the Associated Press.