CHICAGO (CBS) — A man was stabbed Tuesday morning on board a Megabus on the Kennedy Expressway.

Illinois State Police responded to the stabbing at 9:45 a.m. on the inbound Kennedy near Randolph. The bus pulled off the expressway after the stabbing.

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Witnesses said a woman stabbed a man after he started acting out of control. It was not immediately clear how many other people were on the bus at the time.

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The victim was taken to Stroger Hospital, but his injuries were not life-threatening, police said.

“ is fully cooperating with the authorities with their investigation. The safety of our passengers, employees and fellow commuters is our top priority,” Megabus spokesman Sean Hughes said in an email.

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The suspect was in custody.