Pakistan's Defence Minister Khawaja Asif has warned that any attack by India could trigger an "all-out war" between the two nuclear-armed neighbours.

Relations between India and Pakistan are cratering following a deadly militant attack in Indian-administered Kashmir that has sparked tit-for-tat reprisals and raised fears of another military escalation between the nuclear-armed rivals.

Indian officials says that Indian and Pakistani soldiers briefly exchanged fire along their highly militarized frontier in Kashmir