Three Bangladeshis including a mother and her child were shot dead by Indian troops along the border between the two countries, Bangladesh's border force said on Monday.
They accused India's Border Security Force (BSF) personnel of intruding into Bangladesh territory near Tentulia, in the north, on Sunday night and and opening fire indiscriminately, reported World Bulletin.
Three Bangladesh nationals were killed and another was critically wounded in the shooting, said a spokesman of Bangladesh Rifles (BDR) border guard.
"We have tightened security along the border and will lodge a protest with the BSF on Monday," he told Reuters by telephone.
He said Tentulia villagers held a BSF member with firearms and handed him to the BDR.
Despite generally friendly relations, Indian and Bangladeshi border guards often exchange fire along their porous border which stretches 4,000 km (2,500 miles) through rice fields, hills, jungles, marshes and rivers.
The victims are usually smugglers, cattle thieves and illegal migrants, they say.
In 2001, at least 16 Indian and three Bangladeshi soldiers were killed in the worst clashes between the two countries.