Former Guantanamo Bay inmates are responsible for American deaths overseas, a senior Pentagon official told lawmakers in March. According to the White House, about a dozen released detainees have launched attacks against U.S. or allied forces in Afghanistan, killing what is said to be six Americans. Most of the attacks targeted military personnel, but one American civilian was also killed. She was a female aid worker who died in 2008 in Afghanistan. Further details on the circumstances of the deaths are considered classified.