Major Nidal Malik Hasan, the US officer alleged to have committed the Fort Hood massacre in which 13 were killed, attended the Dar al-Hijrah mosque in Great Falls, Virginia, where several of the 9/11 terrorists prayed, the British Telegraph reported Sunday. According to the report, the FBI is investigating whether Hasan ever met with any of the 9/11 terrorists. Imam Anwar al-Awlaki, has been described as an al-Qaida supporter and Hasan held "deep respect" for him, the Telegraph reported.