A day after the U.N. appealed for restraint following Tuesday's deadly attack in Indian-administered Kashmir, India reported an exchange of fire across the de facto border in the disputed region.

The nuclear-armed rivals ramped up tit-for-tat diplomatic offensive following a deadly attack on tourists in Pahalgam.

Indian and Pakistani troops exchanged fire for a third night in a row, and India has held naval drills.Troops from India and Pakistan have fired small arms along Kashmir's Line of Control for a third night as tensions grow following Tuesday's deadly militant attack on tourists in the Indian-administered section of the contested region.