NEW DELHI — A deadly attack on tourists in Indian-controlled Kashmir has again moved India and Pakistan closer to war as the two rivals downgraded diplomatic and trade ties, closed the main border crossing and revoked visas for each other’s nationals.

Indian officials said the army had a brief exchange of fire with Pakistani soldiers along their highly militarized frontier in the Himalayan region of Kashmir, as the nuclear-armed rivals ramped up ti

The United Nations has urged India and Pakistan to exercise “maximum restraint” after they ramped up a tit-for-tat diplomatic offensive following a deadly attack on tourists in Indian-controlled Kashm