Fresh allegations of racist chanting by Chelsea fans have emerged, this time at London's St Pancras station.
A number of men were heard shouting offensive remarks at the station on Wednesday evening, the day after the club's Champions League encounter at Paris St-Germain. They are believed by police to be supporters returning from the French capital by train.
Superintendent Gill Murray, of British Transport Police (BTP), said: "The racist chanting was reported by a member of the public who was disgusted by the behaviour of the men who had travelled on the 18.40 service from Paris Gard du Nord. The men shouted as they walked through the station having alighted from the train a short time earlier.
"If you travelled on the train from Paris or were at the station and have information which can assist our investigation I would urge you to get in touch as a matter of urgency."
A separate investigation is already underway into video footage apparently showing Chelsea fans stopping a black man from entering a Paris Metro carriage on the night of the match before directing vile abuse at him.
Chelsea FC has suspended five supporters who are believed to have been involved in that incident and police have published images of three suspects they are seeking.
Mr Murray said: "It's clear that unfortunately there is still a minority who think it is acceptable to behave in such an abhorrent manner.
"There is more that needs to be done to address the issue once and for all and BTP is actively working with football clubs, the football authorities and other key agencies to tackle this appalling behaviour."
* Anyone with information about the incident at St Pancras can call BTP on 0800 40 50 40 or by texting 61016. Alternatively, you can call Crimestoppers, anonymously, on 0800 555 111.