Rescue crews are still digging bodies out of the rubble of a drug rehabilitation hospital in the Afghan capital Tuesday morning, after officials there said an overnight Pakistani airstrike killed at least 400 people at the facility.

Pakistan has been the Afghan Taliban's closest friend for decades. It was Islamabad that helped give birth to the Taliban in the early 1990s - as a way to give Pakistan "strategic depth" in its rivalry with India.

The documentary from Shakiba Adil and Elina Hirvonen, premiering at CPH:DOX in Copenhagen, features clandestinely shot mobile phone footage and shows "the power of art to keep hope and humanism alive.

Ongoing clashes between Taliban forces and the Pakistani military have resulted in civilian casualties, prompting a UN resolution urging counter-terrorism efforts. Accusations of harboring militants exacerbate tensions.