shooter acted alone, however, 21 saudi nationals who trained at u.s. bases are being kicked out of the country. their social media accounts turned up postings with jihadist material and child pornography. >> reporter: the f.b.i. also provided harrowing details of the attack. the december 6th shooting at the pensacola air station lasted 15 minutes. with 180 rounds of ammunition, the saudi gunman killed three american sailors and wounded eight other people before police killed him. two weeks before, the aviation student had visited new york city's 9/11 memorial. >> the shooter fired shots at pictures of the current u.s. president and a former u.s. president, and a witness at the scene recounted that he made statements critical of american military actions overseas. >> reporter: two iphones were recovered at the scene, one in the gunman's car and one near his body that he had deliberately put a bullet through.