At around 6.10pm on the 10th of June, a group of men boarded a Piccadilly line train at Heathrow Terminal 5 Underground station.

While on the train, they sexually assaulted several teenage girls and an adult woman.

They then got off the train at Knightsbridge Underground station.

Detectives believe the man in the image may have information which could help their investigation.

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.