WASHINGTON (Reuters) -A drone strike in Kabul last month killed as many as 10 civilians, including seven children, the U.S. military said on Friday, apologizing for what it called a "tragic mistake". In a statement, Defense Secretary Lloyd Austin said the drone strike had killed a Mr. Ahmadi who worked for a non-profit called Nutrition and Education International. While it is rare for senior Pentagon officials, including the defense secretary, to apologize personally for civilians killed in military strikes, the U.S. military does publish reports on civilians killed in operations around the world. Reports had emerged almost immediately that the drone strike in a neighborhood west of Kabul's Hamid Karzai International Airport had killed civilians including children. Following the suicide bombing at the airport, the U.S. military launched a drone strike in eastern Afghanistan that it said killed two Islamic State militants.