Islamabad has formally protested to India over a border clash on Sunday following an attack on an army post in the disputed region of Kashmir which killed one Pakistani soldier.

India’s deputy high commissioner was summoned to the Foreign Ministry over what Pakistan calls an “unprovoked” attack, the Pakistani Foreign Office said in a statement on Monday.

Pakistan and India accused each other of violating the ceasefire in Kashmir. According to the Pakistani military’s public relations office, troops exchanged gunfire after Indian forces crossed the “line of control” dividing the Indian and Pakistani sides of Kashmir.

A spokesman for the Indian army in Kashmir denied the raid, calling the allegations as “baseless”, and said that Pakistani troops “initiated unprovoked firing” of mortars and automatic weapons at Indian posts.

“We retaliated only using small arms. We believe it was clearly an attempt on their part to facilitate infiltration of militants,” Col. Brijesh Pandey said, adding that Pakistani shelling had destroyed a home on its side.

Kashmir has often been a flashpoint of violence between the two neighbors who have fought two full-scale wars over control of the region.