fifty-two american diplomats and citizens were held Defending hostage for 444 days from november 4 , 1979 , to january 20 , 1981 , after a group of iranian college students belonging to the muslim student followers of the imam 's line , who supported Supporting the iranian revolution Change_of_leadership , took over Conquering the u.s. embassy in tehran .

days after the shooting , reports in the media revealed Reveal_secret that a joint terrorism task force had been aware Know of a series of e-mails between hasan and the unk imam anwar al-awlaki , who had been monitored Scrutiny by the nsa as a security threat , and that hasan 's colleagues had been aware Know of his increasing radicalization for several years .