A crowd arrives on the midway during the opening night of the Electric Daisy Carnival at the Las Vegas Motor Speedway in Las Vegas on Friday, June 16, 2017. Organizers of the largest music festival in North America are reminding attendees to report any suspicious activity they might witness during the event, less than a month after a deadly terrorist attack struck a concert in England. (L.E. Baskow/Las Vegas Sun via AP)
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