LONDON, Jan. 9 (UPI) -- Three men aboard an Emirates Airlines flight awaiting takeoff from London's Heathrow Airport were arrested after triggering a security alert, police say. Scotland Yard said three men, aged 58, 48 and 36, were taken into custody aboard the plane Friday as it sat on a runway waiting to leave for Dubai, saying the men were arrested on suspicion of making a bomb threat, The Daily Telegraph reported. A witness told Britain's Sky News that five armed policemen rushed aboard the plane and quickly handcuffed one of the men, described as a white male.