UPDATE: 4 Shot at Suburban Chicago Mall, Gunman in Custody

DEVELOPING STORY: A large outdoor shopping mall in Illinois has been locked down after a Thursday night shooting, according to Oak Brook police. One suspect is in custody. At least four people were shot.

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Alex Gay, who was with her boyfriend, began walking past Neiman Marcus, heading to Nordstrom, when she saw people, including a security guard, start running.

“I’m shook up,” Gay told the Chicago Tribune. “It was scary everyone was sprinting out of the mall as sirens went over intercom saying ‘Emergency. Evacuate. Seek shelter.’ I almost got trampled.”

Another eyewitness reported seeing at least three people being loaded onto stretchers and taken to nearby ambulances.