Saskatoon emergency crews were called to two suspicious package calls within a three-hour period on Monday.
The latest call came in at around 12:40 p.m. CT.
A package containing what appeared to be a white powdery substance was delivered to the Saskatoon Cancer Centre on the University of Saskatchewan campus.
Members of the Saskatoon Fire Department hazmat materials unit responded and test results showed the substance was not hazardous.
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The first suspicious package call came in at around 10:20 a.m.
An envelope containing a white powdery substance had been delivered to a business in the 200-block of 4th Avenue South.
The package was tested and it was determined the contents were non-hazardous.
Traffic restrictions were in place while police and fire crews investigated. Those have now been lifted.
Detectives with the targeted enforcement unit are investigating both incidents.
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This is the four suspicious package call in Saskatoon in under two weeks.
On March 16, crews were called to the River Centre Building after a suspicious package was delivered to the fifth floor.
Buena Vista School was evacuated on March 23 after a suspicious package was delivered by registered mail.
In both cases the substances turned out to be non-hazardous in nature.