A Cathay Pacific flight to Thailand was delayed for four hours on Monday due to a bomb threat warning.

Flight CX751 departing from Hong Kong to Bangkok was scheduled to take off at 2:20pm but was held up after a call was made to the airline’s customer service hotline claiming there were bombs were on board.

The call was made by a woman speaking English “with an accent,” according to Apple Daily.

It is understood that the flight had left the aircraft parking bay and was waiting to take off.

Cathay immediately informed the flight crew and evacuated 330 passengers back to the departure hall.

Police conducted a thorough check of passengers, baggage and the aircraft but did not find a bomb.

Cathay arranged another aircraft for the affected passengers and it departed at 6:07 pm.

Police classed the case as bomb hoax and are tracking down the caller.