Rescuers recovered more bodies from the rubble of a drug rehabilitation hospital in Kabul on Tuesday after officials said an overnight airstrike killed more than 400 people, in a dramatic escalation of a conflict between Pakistan and Afghanistan that is now in its third week.

Both sides have claimed to inflict heavy losses in what has become their deadliest fighting in years, a confrontation Pakistan has described as an “open war” with Afghanistan.

Tensions between nuclear-armed Pakistan and Afghanistan’s Taliban regime sharply escalated in late February, further heightening regional instability and raising concerns about the risk of a prolonged conflict.

Pakistan says it struck militant hideouts in Afghanistan as cross-border fighting intensified and both sides traded blame. On Sunday, Pakistan’s information minister says the military hit equipment st

The Afghan government said on Tuesday that about 400 people were killed in a Pakistani air strike on a drug rehabilitation centre in the capital, Kabul, in the deadliest attack