The shooter arrived at the site 3 hours early. At 3pm he triggered a metal detector as he tried to gain access to the event, and was found to be carrying a rangefinder – a gun sight typically used by marksmen preparing to shoot at distance. Security officers allowed him in. | The shooter arrived at the site 3 hours early. At 3pm he triggered a metal detector as he tried to gain access to the event, and was found to be carrying a rangefinder – a gun sight typically used by marksmen preparing to shoot at distance. Security officers allowed him in. |