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.
Residents Oppose Stanley Avenue Development
But Niagara Falls council moving forward, with provincial pressure to build homes
NRP Looking for Driver of Stolen Dodge
They say it crashed into a tree this morning in St. Catharines, a passenger was seriously hurt
Niagara Health Calls Out "Misinformation"
Niagara Health is responding to a news conference by Fort Erie and Port Colborne mayors
Man Dies in Niagara Falls Collision
Police say a motorcycle and car crashed at Dorchester and Thorold Stone Roads
Arrest Made in Niagara on the Lake Standoff
Police called over reports of shots fired
Province Pushing Greater Hydrogen Use
Pilot program to give electricity discounts to hydrogen producers considered
St. Catharines Decides on Vote Tabulators
But the city is against using internet voting
Hamilton Closes Linc This Weekend
The city says it's for maintenance, as well as part of QEW