Three people were injured after shots were fired from a single vehicle in the parking lot, according to Six Flags. The vehicle then immediately drove away.
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Park security and officers from the on-site Gurnee Police Department Substation responded immediately, park officials said.
Two people were transported by emergency services for evaluation. A third person declined treatment, the park said.
"The park closed early with guests and team members departing under direction of the Gurnee Police Department," Six Flags said in a statement.
People can be seen in video huddling together inside the park. Another video shows police lights in the distance.
3 injured after shooting in parking lot at Six Flags Great America in Illinois, park says
The amusement park is located in Gurnee, Illinois, approximately 45 miles north of Chicago.
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Social media reports of an active shooter have been dispelled by the Lake County Sheriff's Office, which is assisting the Gurnee Police Department with the investigation. A spokesperson saying there is no evidence of that at this time.
No further details have been provided by police.
This is a developing story and more information will be provided when available.