India accused Islamabad of supporting "cross-border terrorism." Pakistan has denied the accusation and a previously unknown militant group calling itself Kashmir Resistance has claimed responsibility for the attack.

India and Pakistan both claim Kashmir in full but control it only in parts. Since India's partition and the creation of Pakistan in 1947, the nuclear-armed neighbours have fought wars over the territory.

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.