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YOUNGSTOWN, Ohio– Youngstown State University was placed on lockdown Monday morning.

A suspect pulled out a gun during a physical altercation inside Kilcawley Center just after 11 a.m., Youngstown State police said. A number of people witnessed the yelling and pushing.

Within minutes, YSU officers arrived and the lockdown was issued. Students and staff were asked to shelter in place and lock all doors.

The suspect, who is not a student at the university, turned himself in and the lockdown was lifted at about 1 p.m.

The incident is under investigation. No charges have been filed.

YSU police said they will review what happened during the lockdown and look to make improvements.

St. Elizabeth Hospital was also on lockdown as a precaution, a hospital official said.