Indian forces fired across the border in the disputed Himalayan region of Kashmir early on Wednesday, killing three Pakistani soldiers, the Pakistani army said on Thursday.
The Pakistani Army added that Indian forces opened "unprovoked" fire across the so-called Line of Control (LoC) which divides the Kashmir region between India and Pakistan in Neelam valley.
"The soldiers were moving from one post to another when they came under fire. Three soldiers were killed," military spokesman Major Gen. Athar Abbas said.
Pakistani forces returned fire in retaliation and the incident was raised with local Indian commanders, he said.
A spokesman for the Indian army in Kashmir gave a different account.
"They opened fire first and we retaliated ... In the morning again they started firing mortars and we retaliated and the exchange of fire continued," Colonel Brar told Reuters.
The incident underlined the fragility of ties between the countries that have fought three wars since 1947.There were frequent exchanges of fire between the two forces before the nuclear-armed neighbors agreed to a ceasefire across the dividing line there in 2003. They continue to exchange sporadic fire.