A handcuffed man escaped from police after he was arrested when he was spotted in the women's toilets at Liverpool Street station.
Officers were called to the station just after 9am on Sunday after a man was spotted in the ladies' loos.
The man was then detained and handcuffed, but still managed to flee from officers at the station.
He is described as white, around 5ft 7ins, of medium build and with short brown hair, wearing blue clothing.
A British Transport Police spokesman said: “Extensive enquiries are taking place to locate the man, including reviewing CCTV and working with other police forces and agencies.
“He is not thought to be a danger to the public, but officers are understandably concerned for the man’s welfare.”
Anyone with information should call British Transport Police on 0800 40 50 40 quoting 146 of 27/02.
