Three injured in shooting at Six Flags Great America in Illinois - CNN

This was not an active shooter incident inside the park," Gurnee police said.

Both Gurnee police and the Lake County Sheriff's Office were handling the scene Sunday night, the park's communication specialist Rachel Kendziora said.

The park closed early in response to the shooting, Kendziora said.

In a statement, Kendziora said the park is grateful for the team members who worked to take care of guests and the Gurnee police for their ongoing security presence at the park.

"Six Flags dedicates our greatest amount of time, talent and resources to safety and security," the statement said.