A man who pushed a commuter onto the tracks at a tube station and attacked two others is being hunted by police.
Anyone who recognises the man from the CCTV images is urged not to approach him, but to dial 999 immediately.
The first terrifying incident on Thursday saw a man assaulted at Baker Street station at 11.50am.
A few minutes later, at around noon, the suspect pushed another man onto the tracks at Finchley Road station.
A third victim has come forward to say he was also assaulted by the man on a train from the same station.