Three members of a family were killed and three others wounded after Pakistan and Indian troops exchanged fire in the disputed Himalayan region of Kashmir.
Pakistani officials on Saturday accused Indian troops of "unprovoked" cross-border firing.
According to police official, Mohammad Shafqat, two sisters and their brother were "martyred". A fourth person who was critically wounded this week died at a hospital, he said.
Pakistani troops are returning fire and carrying out a "befitting response," the military said in a statement.
However, an Indian army officer Saturday blamed Pakistan for initiating the firing, and also described the Indian troops' response as "befitting". The officer spoke on condition of anonymity as he was not authorized to brief reporters.
Although such shoot-outs are common, the latest one came a day after Pakistan's navy said it had intercepted Indian submarines entering the country's territorial waters in the Arabian sea. India denied the claim.
Pakistan's foreign ministry spokesman, Nafees Zakaria, posted a tweet to express his sympathies for those who lost their loved ones in the cross-border firing.
Pakistan has said India is escalating tension to divert the world community's attention from its human rights violations in Indian-controlled Kashmir, and says its army responds with restraint when under attack.