Police said the Waste Management facility on the South Side was evacuated at about 6 a.m. Thursday after a worker discovered the object, which strongly resembles a real grenade, in a bin in a sorting area, WGN-TV, Chicago, reported.
A police spokesman said the object was eventually found to be a practice grenade with no charge and it was turned over to the Bomb and Arson Unit for disposal.
The Chicago Fire Department said workers were allowed to re-enter the facility shortly before 8 a.m.
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