British Transport Police have issued CCTV images regarding a robbery that took place on board a Picadilly Line train on Saturday, 7 February. 

Around 4 pm, a man boarded the train at South Harrow Underground station and approached a teenage passenger.

The man claimed to have a knife on him and revealed a wooden handle coming from his waistband, also demanding that the teenager hand over his phone.

Detectives believe the man pictured in the released CCTV images may have information in connection with the investigation.

Anyone who may recognise the man is asked to contact the British Transport Police by texting 61016, or by calling 0800 40 50 40, quoting reference 476 of 7 February.

You can also contact Crimestoppers anonymously on 0800 555 111.