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.

The Pakistani government announced a series of sweeping retaliatory measures a day after India took aim at its neighbor and archnemesis.

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.