LAHORE/NEW DELHI, May 8 (Reuters) – Pakistan and India accused each other of launching drone attacks on Thursday, and Islamabad’s Defence Minister said further retaliation was “increasingly certain”, on the second day of major clashes between the nuclear-armed neighbours.

Pakistan said it shot down 25 drones from India, while India said it air defences had stopped Pakistani drone and missile attacks on military targets, dashing hopes they would soon bow to pressure to end their worst confrontation in more than two decades. World powers from the U.S. to Russia and China have called for calm in one of the world’s most dangerous, and most populated, nuclear flashpoint regions. The U.S. Consulate General in Pakistan’s Lahore ordered staff to shelter in place.