An Air France flight AF83 from San Francisco to Paris has been diverted to Montreal's Trudeau Airport after a bomb threat, RT reports.

Pierre-Elliott-Trudeau Airport’s spokesman François-Nicolas Asselin told Le Journal de Montreal newspaper there are 231 passengers and 15 crewmembers on board. The airport is in contact with Air France and the “investigation is on” to find out more.

One of the passengers aboard has tweeted a picture from inside the plane showing fellow travellers getting ready to exit the aircraft.

Passengers have been allowed to leave the plane in groups of 50, and are being questioned by investigators.

Montreal’s police service has been called to assist at the scene.

The flight departed on Monday, December 7, about 3pm San Francisco time, and was due to arrive in Paris on Tuesday at 10.30am.