Indian Prime Minister Narendra Modi vowed on Thursday to pursue, track and punish terrorists and their backers in a strong reaction to a deadly militant attack on tourists in Kashmir, where police have identified two of the gunmen as Pakistani.

India has hit Pakistan with a raft of mostly symbolic diplomatic measures after a deadly attack it blames on its arch-rival, but analysts warn a military response may yet come. Pakistan held a rare national security meeting on Thursday after New Delhi's punitive diplomatic measures.

India's External Affairs Ministry said the Indus Water Treaty will be suspended after an attack in Kashmir left over two dozen dead.