 In her briefing about possible suspects behind the nuclear blast (as  LtCol Devoe walks in), you can hear Dr. Kelly name "Shamil Basayev"  and describes him as a militant Chechen rebel leader. This is true.  Shamil Basayev was suspected as the mastermind in the school  takeover in North Ossetia, which captured more than 1000 hostages in  September, 2004. He was killed by an explosion on 10th July, 2006,  near Ekajevo, Ingushetia.