A 16-year-old girl was subjected to an "abhorrent" sex assault on board a London train, police said.
The girl was allegedly attacked on a Great Western Railway service travelling between West Drayton and London Paddington on Wednesday, February 15.
She got on the train just after 10.40am and was standing up when a man joined at Hayes and Harlington and stood very close to her, British Transport Police said.
As the train continued towards London, the man began to press against the girl and touched her inappropriately.
She became extremely distressed and asked the man to stop, which alerted other passengers on the train.
Investigating officer Detective Constable Suleman Yazdani said: “This was a nasty and abhorrent assault which has left the victim frightened to use public transport.
“She was terrified by this man’s sexually aggressive behaviour, I am grateful that she had the confidence to report it to police.
"We’ll now do everything in our power to find this perpetrator.”
The offender is black, approximately 30-40 years old and around 5’10”. He was slim and was wearing a long black coat, black trouser and had a flat cap on.
Anyone with any information is asked to contact BTP by sending a text top 61016 or call 0800 40 50 40 quoting reference 268 of 16/02/17. Alternatively, contact Crimestoppers on 0800 555 111.
