By Julian Pecquet - 10/11/12 03:13 PM EDT
Rep. Peter King (R-N.Y.), in a letter to Secretary of State Hillary Clinton, singles out Ansar al-Sharia, a Libyan group believed to have ties to al Qaeda in the Islamic Maghreb. Libyan authorities have blamed Ansar al-Sharia for the attack, but the Islamist group has denied responsibility, although it's possible individual members might have been involved.
King wants the State Department to label the entire group a terrorist organization. The group, which has hundreds of armed fighters who helped topple Moammar Gadhafi last year, is one of the most powerful militias in Libya.