Northwestern Memorial Hospital was no longer on lockdown after a phone threat prompted SWAT response Sunday night on the Near North Side, according to Chicago police.
The hospital then went into lockdown as part of security and safety protocols, police said.
A systematic search revealed no threat to public safety and all personnel were accounted for, officials said.
An officer at the scene confirmed the hospital was cleared about 10:20 p.m.
No further details were immediately available.