ABC News Today

CHICAGO (CBS) — Two people were hospitalized Sunday after a shooting in the parking lot of the main entrance of Six Flags Great America in Gurnee.

The shooting happened around 7:50 p.m. when the park was closing. Several ambulances were dispatched to the scene.

The shots came from a single vehicle in the parking lot that immediately drove away, according to a statement from Six Flags.

Two people were taken to the hospital for evaluation and a third person refused treatment.

Video circulating on social media shows park visitors crouching down and hiding where they had been in line.

Witnesses say they saw other parkgoers running after the shooting.

“I thought there were fireworks right away. Then we saw hundreds of people running,” said Charlie Donda. “It was pretty scary, but we’re safe.”

Charlie was with his friends and ran to the water park to hide. His father, Brian Donda, said his son did the right thing.

“They did the right thing and they knew what to do. They’re home smiling and safe,” he said.

Nicole Ellsworth was also at the park with her daughter and says the scene was chaotic with people running everywhere.

“People were looking for their children and crying. The officers ran with their guns drawn,” he said.

She says it was not immediately clear after the shooting whether it happened inside or outside the park.

CBS 2’s Sabrina Franza spoke to a witness who helped mothers with their strollers inside the park.

“It was people walking by saying they were shooting, so I guess they were running from front to back. And they just started running.” Michelle Smith said. “People were falling, I’m trying to help people and their children.”

Employee Jeffery Cowell helped hide some of the visitors after hearing over the radio to lock down their buildings and make sure team members and guests were safe.

“Kids crying for their mother, mother crying for her children. It was an experience I don’t want to happen again,” he said.

Police tape surrounds four vehicles that remained in the parking lot.

Six Flags is an amusement park located at 1 Great America Parkway in Gurnee.

Visitors to the park undergo extensive screening, including bag checks and walking through metal detectors, before entering the park.

This is the second shooting in a public place where families gather after the Highland Park parade mass shooting last month.

No one is under arrest. The investigation is ongoing.