Police are investigating claims of racist chants by football fans on a train . Four fans , thought to be Chelsea supporters , were ordered off the train . Witness says a black man moved carriage in disgust at the fans . Comment: Seven Chelsea fans being sought over incident at St Pancras station .
Police are investigating claims of racist chants by football fans on a train . Four fans , thought to be Chelsea supporters , were ordered off the train . Witness says a black man moved carriage in disgust at the fans . Police are also investigating Chelsea fans ' behaviour on Paris Metro . Seven Chelsea fans being sought over incident at St Pancras station .