Multiple Canadian airports faced bomb threats Thursday morning that grounded flights and are expected to cause widespread delays, according to air traffic control manager Nav Canada.

"Early this morning, NAV CANADA was made aware of bomb threats affecting facilities in Ottawa, Montreal, Edmonton, Winnipeg, Calgary and Vancouver," Nav Canada said in a statement posted to X around 8:30 a.m. ET.

"Employees at impacted locations are safe, and a temporary ground stop has been implemented at the affect…