Canadian airports experienced disruptions due to widespread bomb threats targeting Nav Canada facilities in multiple cities, including Ottawa, Montreal, and Vancouver. Evacuations and subsequent investigations led to flight delays and ground stops.

Operations are back to normal after multiple Canadian airports faced bomb threats Thursday morning that grounded flights and were expected to cause widespread delays, according to air traffic control manager Nav Canada.

Bomb threats were reported at multiple airports across Canada, but the agency managing air traffic control said service had started to resume at as the police investigate.