Six Flags Great America and its Hurricane Harbor water park are bringing back their chaperone policy a week after shots were fired in the Great America parking lot.

Six Flags Great America re-implements a chaperone policy due to safety concerns, requiring minors under 16 to be accompanied by an adult. The policy is strict from July 17-20 and evenings after that.

Six Flags Great America located in Gurnee, Ill., announced they will be reactivating their chaperone policy for guests ages 15 years and younger.