BTP officers investigating a robbery and sexual assault at Watford High Street station are today releasing a CCTV image.
The incident happened at 6.40pm on Friday, April 12.
A group of 15 boys and girls are reported to have surrounded a group of three boys and two girls on a platform at the station.
The larger group then took items from the victims, while doing this, boys within the larger group inappropriately touched two of the female victims.
The victims then managed to get away from the group. The suspects remained on the platform.
Officers believe those pictured may have information that could help their investigation.
Anyone who recognises them is asked to contact BTP by texting 61016 or by calling 0800 40 50 40 and quoting reference 216 of 13/04/19.
Alternatively, call Crimestoppers anonymously on 0800 555 111.