Normal service has resumed after bomb threats that caused delays and evacuations at multiple Canadian airports earlier Thursday, NAV Canada said in a statement Thursday.

NAV Canada provides air traffic control operations to Canadian airports. On Thursday morning, their facilities in Ottawa, Montreal, Edmonton, Winnipeg, Calgary and Vancouver were the target of bomb threats.

The agency now says normal service has resumed but cautioned travellers all over the country to check with their airlines for potential delays.

“Following this morning’s security threat at multiple NAV CANADA sites, all operations have now returned to normal. Travelers are encouraged to check directly with their airlines for the latest updates, as delays may still occur,” the statement said.

“We sincerely thank the airlines and passengers for their patience, and we commend our employees and law enforcement for their swift response,” it added.

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NAV Canada said it cannot reveal the exact nature of the threat.

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“In the interest of security protocols, we cannot disclose the specific nature of the threat. However, we will continue to work closely with authorities as the investigation progresses,” the statement said.

A spokesperson at the Montréal-Trudeau International Airport told Global News some flights were affected after the NAV Canada control tower was evacuated, but service had now resumed.

Earlier in the morning, Reuters had reported investigations into security incidents at Ottawa International Airport and Montreal’s Pierre Elliott Trudeau airport, which could disrupt operations.

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Ottawa International Airport in a social media post said, “The security investigation at YOW has safely concluded and regular operations are resuming. Thank you for your understanding and patience.”

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The Winnipeg Airport Authority said they experienced “minimal impact” on their services as a result of the security incident.

“We are not expecting any further delays as the issue has been resolved. Media are directed to contact Nav Canada for further information,” the statement said.

The RCMP told Global News that they received the bomb threat at the Winnipeg Richardson International Airport at approximately 6:05 a.m. local time Thursday morning.

“The phone call stated there was a bomb in the control tower. Officers conducted a physical search of the tower and no suspicious items were located, the statement added,” the RCMP statement said.

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Edmonton airport said, “The safety and security of our passengers, team members and partners is our highest priority.  We can confirm a security incident had minimal impact on operations. We recommend you connect directly with NAV Canada for further details.”

With files from Reuters

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