A senior FBI official identified one of the suspects in the attack as Elton Simpson, an Arizona man who was previously the subject of a terrorism investigation, ABC News reports.
FBI agents and a bomb squad reportedly converged on Simpson's apartment in Phoenix, where police were conducting an initial search with a robot.
KPNX-TV (Channel 12), an NBC affiliate in Arizona, reported that the two suspects had been roommates. The second man, though, has not been named officially or in media accounts.
Simpson was well known to the FBI, ABC News reported. Five years ago he was convicted for lying to federal agents about his plans to travel to Africa, "but a judge ruled the government did not adequately prove he was going to join a terror group there."
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