Ahmed Abu Khattala, a former prisoner under the Gaddafi regime and Ansar al-Sharia senior commander, was charged in a sealed indictment in August 2013 for his role in the attack on a U.S. diplomatic facility in Benghazi which killed four Americans, including the U.S. ambassador, J. Christopher Stevens. In 2013, Abu Anas al-Libi, a Libyan militant wanted for his role in the 1998 United States embassy bombings was seized in Tripoli by U.S. troops.