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.

New Delhi suspended a water-sharing treaty, announced the closure of the main land border crossing with Pakistan, downgraded diplomatic ties and withdrew visas for Pakistanis on Wednesday night, just over 24 hours after gunmen killed 26 men in Indian-administered Kashmir.

And then on Thursday, New Delhi said it had suspended visas services "with immediate effect" and ordered all Pakistani nationals to leave the country, with the exception of remaining diplomats.

Experts say that a military response may still be in the pipeline, with some speculating that a response may come within days while others say weeks.

New Delhi accuses Islamabad of supporting "cross-border terrorism" -- claims Pakistan denies -- and police in Kashmir identified two Pakistani nationals among the three alleged gunmen.

India's Prime Minister Narendra Modi vowed on Thursday to punish all those responsible "to the ends of the Earth".

Relations between the nuclear-armed neighbours have sunk to their lowest level in years and some fear New Delhi's diplomatic moves may........

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