Multiple threats were reported in the city, Mirroring reports from across North America.
Calgary Police Service says the threats are being sent by email, matching reports from various locations across North America and are believed to be connected.
The Police do not believe the reports are credible but are taking precautions when responding to the calls.
No Areas in Calgary have been evacuated yet and Police at saying the emails have unspecific threats and are demanding bitcoin payments.
Calgary police also say there will be increased wait times for certain officers but emergency calls will not be impacted.