Air France flight to Paris departs after emergency landing in Montreal

An Air France flight that was diverted to Montreal overnight returned to the air early Tuesday morning.

Air France Flight 83 from San Francisco to Paris made an emergency landing in Montreal late Monday night when authorities received an anonymous bomb threat concerning the plane.

At least 15 fire trucks and police cars surrounded the airplane when it landed at Trudeau airport.

Passenger Gilles Raymond of San Francisco said after about five hours in the air, the pilot made an announcement that they needed to land in Montreal for technical reasons. He said once the plane had landed, the pilot said authorities would have to do a thorough security check of the plane and passengers and that everyone would have to disembark.

"Everyone is pretty relaxed," Raymond said while still inside. "There was no panic, no stress. Everyone is waiting in their seats. Some people are sleeping, and some are checking their phones or eating ice cream that the flight attendants gave them."

He said passengers spent at least an hour on board the plane during verifications.

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Officials conducted a full search of the plane, checking every piece of luggage and meeting with all 231 passengers and the 15 members of the crew, before determining the threat was false.

Air France said an investigation will be carried out into the origin of the threat, and promised to send passengers safely to their destinations.

Spokeswoman Ulli Gendrot said all passengers were safely off the plane. She would not elaborate on the nature of the threat.

Airlines around the world face sporadic threats and occasionally divert planes as a result.

Given the all-clear, Flight 83 took off at 5:30 a.m. en route for Paris.

With a file from The Associated Press