Rahami's screed also praised 9/11 mastermind Usama bin Laden and Nidal Hasan, the former Army officer who went on a deadly shooting rampage in 2009 at Fort Hood, Texas.  Hasan was also a follower of Awlaki. The Counter Extremism Project’s research counted 77 extremists — 43 U.S. extremists and 34 European extremists — with ties to Anwar al-Awlaki. They include the Pulse nightclub shooter Omar Mateen in June, as well as Syed Farook, one of the shooters in the San Bernardino massacre in December 2015.