Pakistan's armed forces launched "multiple attacks" using drones and other munitions along India's entire western border on Thursday night and early Friday, the Indian army said, as conflict between the nuclear-armed neighbors intensified.

The old enemies have been clashing since India struck multiple locations in Pakistan on Wednesday that it said were "terrorist camps" in retaliation for a deadly attack in its restive region of Kashmir last month, in which it said Islamabad was involved.

Pakistan denied the accusation but both countries have exchanged cross-border firing and shelling and sent drones and missiles into each other's airspace since then, with nearly four dozen people dying in the violence.