The State Department on Friday designated two Libyan groups, including one led by a militant once held at Guantanamo Bay, as terrorist organizations and said they were involved in the deadly attack on U.S. diplomatic mission in Benghazi, NBC News reported. The groups are Ansar al-Sharia in Benghazi and Ansar al-Sharia in Darnah. Their leaders, Ahmed Abu Khattalah and Sufian bin Qumu, were designated as global terrorists by the State Department. The State Department has been offering rewards of up to $10 million for information that leads to an arrest for those responsible in the attacks. Four Americans, including Ambassador Christopher Stevens, were killed in the Benghazi raid.