KABUL: Pressure mounted on Washington t yesterday to come clean over the apparent fo US air strike on an Afghan hospital that killed 22, an incident the Pentagon chief al said was"confused and complicated" but ra which medical charity MSF branded a pi war crime. Doctors Without Borders(MSF) said the on Sunday it has closed the trauma centre, seen as a lifeline in a war-battered region cri with scant medical care, and demanded an atte independent probe into Saturday's devas- mis tating air raid. US President Barack Obama has prom- trod ised a full investigation but the interna- tion tional outrage over the deadly incident coo has piled pressure on Washington for a pro more transparen probe. "Under the clear presumption that a war crime has been bom demands a full pita committed