In 2002 , al-Awlaki was the first imam to conduct a prayer service for the Congressional Muslim Staffer Association at the U.S. Capitol . The prayers were for Muslim congressional staffers and officials for the Council on American-Islamic Relations . That year , Nidal Malik Hasan visited al-Awlaki 's mosque for his mother 's funeral , at which al-Awlaki presided . In November 2009 Hasan killed 13 and wounded 32 in the Fort Hood shooting . Hasan usually attended a mosque in Maryland closer to where he lived while working at the Walter Reed Medical Center ( 2003 – 09 )
Fort Hood shooting
2009 Fort Hood shooting
Anwar al-Awlaki