Relations between India and Pakistan are cratering following a deadly attack in the disputed Himalayan region of Jammu and Kashmir that left more than two dozen tourists dead, raising fears of military escalation between the nuclear-armed rivals.

India's Prime Minister Narendra Modi says the gunmen behind a terrorist attack on tourists in the Kashmir region "will not be spared!"

Pakistan said it was suspending trade and closing its airspace to Indian airlines, while India suspended a water-sharing treaty, after Tuesday’s attack in Kashmir.