 Sources also say that same person, later identified as Crooks, was pacing around magnetometers and the security barrier before the event began. According to multiple different videos and witness interviews, it was at least 80 seconds from the time people alerted police to the time the shooting began. And that's Fox's David Spunt at the Justice Department. President Biden addressing the NAACP convention today in Las Vegas, defending his pick of Vice President Kamala Harris.