India said on Monday it had responded to 'unprovoked' firing from Pakistan along the de facto border for the fourth consecutive night, as it deepens its search for militants in the region following last week's deadly attack on tourists in Kashmir.

In the days since, tensions have risen dangerously between India and Pakistan, which have fought two of their three wars over Kashmir.

Anger in Indian-run Kashmir escalated on Monday over sweeping detentions in the hunt for the gunmen who carried out a deadly attack last week that New Delhi blames on arch-rival Pakistan.New Delhi has accused Pakistan of supporting "cross-border terrorism" after gunmen killed 26 people on April 22,