Police have released CCTV images of a suspect after a man was forced to hand over his phone and pin in a knife-point robbery on a train.

The victim boarded a Central Line train in Gants Hill at around 11.10pm on Tuesday, September 18, and was approached by a man asking for his phone.

When he refused, the mugger pulled out a knife and threatened him before making off with his phone, pin and cash at Leytonstone station.

Officers wish to speak with the man in the CCTV images.

Anyone who thinks they may know him is asked to contact the British Transport Police by texting 61016 or calling 0800 405040 quoting reference 17 of 19/09/2018.

To give information anonymously call Crimestoppers on 0800 555111.