Authorities have determined no active threat exists at Northwestern Memorial Hospital after the medical facility was placed on what officials called an "armed intruder alert" following a threatening phone call, police and hospital administrators said.
At approximately 8:40 p.m., a phone threat was made to the hospital, causing the facility to be placed on lockdown and notify the Chicago Police Department, according to a CPD spokesman.
A "systematic search" of the hospital was conducted, and police found no threat to public safety, authorities stated.
In an email, a hospital spokesperson said Northwestern was placed on an "armed intruder alert" and law enforcement promptly responded to the scene.
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The hospital resumed operations before 10:40 p.m., the spokesperson said.
Additional information wasn't immediately available.