Four people were killed in an exchange of fire between Indian and Bangladeshi border troops while their top officials were wrapping up a meeting in Dhaka, security officials said on Sunday. The victims of Saturday's gun battle included two soldiers of India's Border Security Force (BSF) and two Bangladeshi villagers, officials on both sides said. "The bodies of the BSF soldiers including an officer clad in civil dress were lying in Bangladesh territory, some 300 yards (meters) from the border line," said a senior official of the Bangladesh Rifles (BDR) border force. "We are investigating why they had intruded into our territory," he told Reuters. The BSF said Bangladeshi troops opened fire without provocation.