Update Aug. 4, 2020: On Tuesday, Cadillac Fairview said a third case of COVID-19 had been confirmed at the mall, this one at Bentley.
Two cases of COVID-19 have been confirmed at Chinook Centre mall in Calgary.
Businesses and staff at the mall were notified of the positive cases on Friday in a letter from mall management.
"The affected clients, H&M and Boston Pizza, acted quickly and responsibly by immediately contacting Cadillac Fairview and Alberta Health Services (AHS). At this point AHS has advised that no further action is required and the building can remain open for business," read the letter, which was obtained by CBC News.
"We strongly urge all clients to follow this example and immediately notify both CF and AHS in the event that any employee, contractor or guest at CF Chinook Centre is confirmed or suspected to have COVID-19."
A spokesperson for Cadillac Fairview, which owns the mall, confirmed in an emailed statement that there were two confirmed cases in the stores' premises, but did not specify if the cases were among shoppers or employees.
The company said the mall has implemented enhanced cleaning, physical distancing measures and increased the number of hand sanitizer stations in response to the pandemic.
A spokesperson at Alberta Health said an outbreak at a facility like a mall is declared if there's evidence of linked transmission of five or more COVID-19 cases with a common exposure.
Alberta Health said officials are conducting contact tracing and that anyone at risk of exposure is being contacted, isolated and tested.