Around 6.10pm on June 10, a group of men are said to have boarded the Underground train at Heathrow Terminal 5 station.
When on the train, they allegedly carried out attacks on a number of teenage girls and an adult woman.
They then got off the train at Knightsbridge station.
Detectives looking into the incident have released a picture of a man they think could help with their enquiries.
ANyone who recognises him is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 289 of 10 June.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.
