Passengers across Canada faced long delays Thursday after bomb threats were received by air traffic control towers at some of the country's busiest areas. Authorities say threats were received at airports in Ottawa,

Multiple "bomb threats" were made at Canadian airports Thursday morning, spurring flight delays, evacuations and investigations into the source, says NAV Canada and local authorities. "Early this morning,

Ground stops were lifted at international airports in Ottawa and Montreal after a bomb threat on Thursday briefly halted departing flights, a US Federal Aviation Administration (FAA) spokesperson said.