 Fox News has learned before the shooting, rally goers spotted a suspicious man with what appeared to be binoculars or a range finder, a device used to measure distances. Here he is right there. 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.