There was a "expected danger" at Brookfield Zoo on Tuesday, which necessitated that visitors shield the exhibit for a few hours.

the office until authorities clear the scene "to be as careful as possible."

a call from an 

Guest at zoo taking steps to harm visitors and themselves, resulting in an emergency mediation line.

The call's data was described as "inconclusive," but authorities imposed a lockdown and attempted to locate the caller.ted

Clean the recreation area with the help of Riverside and Brookfield police officers

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