Doctors Without Borders demands international probe into Kunduz air strike

The Medecins Sans Frontieres (MSF) charity demanded Wednesday the opening of an international fact-finding investigation into a deadly US air strike on a hospital it was running in the Afghan city of Kunduz.

"We cannot rely on an internal military investigation," Doctors without Borders chief Joanne Liu told reporters, insisting that an "international humanitarian fact-finding commission" should probe the attack.

"This was not just an attack on our hospital, it was an attack on the Geneva Conventions," Liu said.

"This cannot be tolerated."

Her comments came after commanding General John Campbell on Tuesday acknowledged that Saturday's air strike in Kunduz, which killed 22 people, including 12 MSF staff, had been a tragic error.

Such a fact-finding commission called for by MSF is an independent mechanism created under international law, but which has never before been used, the charity said.

It would simply establish the facts and would not determine criminal accountability.

MSF has branded the strikes a war crime, and has pulled out of Kunduz in the aftermath of the attack.

Three investigations have already been opened into the incident, one by the Americans, one by the Afghans and one by NATO.