Pakistan's leader said his nation was open to a neutral investigation on Saturday into a deadly attack in Indian-run Kashmir that New Delhi blames on Islamabad, and that has sent fraught relations into a tailspin with soldiers exchanging gunfire across their contested frontier.

Indian and Pakistani troops exchanged fire along the Kashmir border for a third consecutive night, New Delhi officials said Sunday, amid escalating tensions triggered by a deadly attack on a tourist hotspot in the Muslim-majority territory administered by India.