The New York to Casablanca service was re-routed to Bangor Airport in Maine about four hours into its journey after ‘a bomb threat to the aircraft’ was made during a phone call, according to a transport security official. But other reports suggest that the flight was grounded after the FBI discovered that a passenger on board was a security threat.

The flight, thought to have been carrying 92 passengers, is due to continue its journey on 20 February.