US President Barack Obama has apologised to the president of aid agency Medecins San Frontieres (MSF) for a bombing that killed at least 22.
The US has said the bombing, which took place in the Afghan city of Kunduz, was a mistake and it was attempting to strike the Taliban.
MSF wants the bombing to be investigated as a war crime.
Mr Obama has also apologised to the president of Afghanistan.
“If it is necessary to hold individuals accountable, that will be done,” said White House spokesman Josh Earnest.
Mr Obama “expressed his condolences” to MSF president Joanne Liu, said Mr Earnest.
“In the United States when we make mistakes, we’re honest about it. We own up to it,” he said.
Mr Earnest also hinted at the possibility of paying victims and their families, a Department of Defense policy.
