Passenger ‘bomb threat’ forces United Airlines flight from LA to Vancouver to make emergency landing at San Francisco before officials deem danger ‘not credible’

A United Airlines flight from Los Angeles to Vancouver had to make an emergency landing after a passenger on board made a bomb threat.

Sources at San Francisco International Airport told local media that a passenger aboard flight UA1909 made a bomb threat Monday evening, which officials quickly realized was not credible.

Investigators are said to have spoken to passengers on board the flight.

Officials said that although the bomb threat was not deemed credible, the plane, which was carrying 156 passengers and crew, had to make an emergency landing.

Flight UA1909, an Airbus A320, was seen making an unexpected loop and heading to San Francisco just an hour after taking off from Los Angeles around 7pm on Monday evening.

The plane completed the loop just above Lassen National Forest.

A spokesperson for United Airlines told MailOnline: ‘United Flight 1909 was diverted to San Francisco this evening due to a potential safety issue on board.

‘The flight landed safely and was met by local police. We work to get our customers to their final destination as quickly as possible.

It comes after Ryanair passengers were forced to take shelter in a shed after a bomb threat at a French airport caused travel chaos.

Families preparing to board a Ryanair flight from Bergerac to London Stansted were ushered into cold and damp agricultural buildings loaded with tractors and equipment.

It is understood that the departure had already been postponed due to a technical problem with the plane when the bomb threat occurred.

A Ryanair source blamed it on a ‘hoax security threat’ and confirmed that ‘passengers were temporarily transferred to a nearby facility while the airport was assessed’.