Three men are wanted by police after a girl was sexually assaulted on a Grantham to Peterborough train.
British Transport Police have released CCTV images of the men wanted in connection with the incident at around 4.10pm on December 13.
The men made sexual remarks to the 13-year-old girl onboard the train, with one then touching her thigh.
When she pointed to her school blazer, he made sexual comments about her.
The men then prevented the girl from moving to another carriage.
The victim and the offenders all alighted at Peterborough Station.
Investigating officer PC Wendy Freeman said: “The girl was left very shaken following this incident and I want to commend her for reporting it to police.
“We will not tolerate anyone being made to feel like this and so I urge anyone with information to come forward immediately.”
Anyone who recognises these men, or has any information, should contact British Transport Police on 0800 40 50 40 or text 61016, quoting reference 299 of January 6.