US President Barack Obama has apologised to medical charity Médecins sans Frontières (Doctors Without Borders) following the bombing of a hospital in Afghanistan, the White House said.
The air strike at the MSF-run hospital in Kunduz killed 22 people, including three children.
The top US commander in Afghanistan says the recent air strike on a hospital in the northern city of Kunduz was a mistake.
General John Campbell told the US Senate armed services committee that it was a US decision to conduct the air strike and that the hospital was "mistakenly struck".
Gen Campbell's evidence came three days after the air strike on the medical clinic killed at least 22 people and wounded dozens more.
The clinic was operated by the medical charity Doctors Without Borders.
Gen Campbell said on Monday that the air strike was requested by Afghan forces who reported being under Taliban fire.
There could be a long wait for answers as to how and why Kunduz hospital ended up being on the receiving end of US air strikes.
Medical charity worker relates how he and colleagues tried to save patients and staff following devastating air strike.