We are appealing for witnesses after a young girl was sexually assaulted on a Tube train in London yesterday.

The girl, who is eight years old, became separated from her family shortly before 5.30pm, on a Piccadilly train between Knightsbridge and Kings Cross.

She reported that a man touched her inappropriately a number of times before she could get back to her family.

Officers are making extensive enquiries to locate the man responsible, including trawling through CCTV from the time of the incident.

He is described as a white man, in his fifties, of a slim build with grey thinning hair. He was wearing glasses, a navy jacket and blue jeans.

Investigating officer Det Con Gareth Jones said: “Were you travelling on the Piccadilly Line eastbound between 5.05pm and around 5.30pm yesterday and did you witness anything that looked out of place to you?

“We are supporting the girl and her family through this investigation and are doing everything to locate the man who did this.

“Do you recognise the description? Or might you have information that could help? Please let us know as soon as you can.”

Anyone with information is asked to contact BTP on 0800 40 50 40 or text 61016, with the reference 384 of 9 April.