Updated 03/05/15 – 1:11 p.m.
CHICAGO (CBS) — A Hoffman Estates hospital was placed on lockdown, and employees were later evacuated, while police investigated what turned out to be a false alarm for an active shooter in the building.READ MORE: Chicago Sky Win First WNBA Championship As They Top Phoenix Mercury
Hoffman Estates Police Lt. Darin Felgenhauer said police received a call at 9:20 a.m. about an automated active shooter alarm at Alexian Brothers Behavioral Health Hospital at 1650 Moon Lake Blvd.READ MORE: At Least 4 People Killed, 17 Wounded In Weekend Gun Violence In Chicago
Police quickly determined the alarm likely was activated by accident. A search of the building turned up no gunman and no firearm, according to Felgenhauer.
Hospital representatives a construction crew working on a project in the building accidentally set off the alarm.MORE NEWS: Chicago Weather: Slow Warm-Up Beginning
Several people were seen evacuating the building with their hands in the air as police were on the scene, but the hospital said they were given the all-clear at 11 a.m.