Following Tuesday's massacre of 26 mostly Indian tourists, hostilities have intensified between India and Pakistan over the hotly contested Kashmir region.

NEW DELHI -Troops from Pakistan and India exchanged fire in disputed Kashmir for a third night in a row, officials said Sunday, as relations between the nuclear-armed rivals plunged to their lowest level in years.

The Pakistani government said that if India followed through on a threat to block rivers it would take it as “an act of war.”