A car approaches the entrance to Six Flags Great America May 24, 2005 in Gurnee, Illinois.Tim Boyle/Getty Images The Gurnee Police Department confirmed to Insider there was an active incident. Six Flags Great America said three people were injured during the shooting. Two people were brought to hospital and a third person declined treatment. Parkgoers were evacuated from Six Flags Great America amusement park in Gurnee, Illinois, on Sunday after reports of a shooting.