kunduz bombing doctors without borders

After U.S. airstrikes destroyed a Kunduz hospital, Afghans must travel for days to reach life-saving treatment.
There's just one problem: It needs the U.S. government's permission to start investigating.
Obama has apologized for the bombing of a Kunduz hospital, but will we ever know how this happened?
The weekend attack in the northern city of Kunduz killed at least 22 people.
U.S. Army General John Campbell says a preliminary report is expected "very shortly."
The U.N. human rights chief said the strike may be considered a war crime.