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.
US President Barack Obama has offered his "deepest condolences" to the medical staff and civilians killed and injured in the bombing of the MSF hospital in Kunduz, Afghanistan.
A statement from the White House said that the Department of Defence had launched a "full investigation".
"Michelle and I offer our thoughts and prayers to all of the civilians affected by this incident, their families, and loves ones," the statement said.
"We will continue to work closely with President Ghani, the Afghan government, and our international partners to support the Afghan National Defence and Security forces as they work to secure their country."
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.