Officials with Canada Post say an outbreak of COVID-19 has hit their massive facility.
They say 121 workers have tested positive since the start of the new year.
About 4,500 people work at the Dixie Road location.
A spokesman says public health officials have indicated most of the cases came from the broader community.
Update: Winter Storm Warning for Niagara
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12 incidents reported south of the border
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Police pulled the vehicle over in Niagara Falls