Police are trying to track down a passenger seen doing chin ups on a bus after woman was punched in the face and racially abused.
CCTV images released by police show the man using the handrail after a woman was hit in the face on the 423 bus at Heathrow Airport. She was on her way home from a night shift and had intervened to stop another woman being abused at a bus stop.
Police released images of the attack which happened on February 25 today and appealed for help to find the attacker. He is described as being a light-skinned Asian man with "untidy stubble". He is approximately 5ft 9in and of medium build.
Anyone with information can contact police on 020 3276 1351.