The U.S. military says air strikes by a U.S. bomber in Afghanistan last month didn't follow strict rules and probably caused civilian casualties.
The military says an estimated 26 Afghan civilians died in the May 4 incident. It is most likely that the deaths occurred during three bombing runs by a B-1 bomber.
Those are the conclusions of a report issued Friday following a lengthy investigation. The military report says it is impossible to know for sure how many civilians died and does not rule out that the number could have been higher.
Local Afghan officials have said as many as 140 people were killed.