A deadly attack on tourists in the disputed Kashmir last week has plunged relations between India and Pakistan to new lows, with both sides hinting at imminent military action.

Pakistan is bracing for Indian military action before Thursday night, officials warned, but cautioned that neither side would benefit from a return to war.

India's foreign minister said he has told Secretary of State Marco Rubio that perpetrators of the deadly attack in Kashmir last week should be brought to justice, as the U.S. sought to calm tensions between nuclear-armed India and Pakistan.