British Transport Police are seeking assistance in locating a group of 5-6 males who sang songs of a sectarian nature on board a busy commuter train.
The group boarded the 18:15 service from Edinburgh Waverley to Glasgow Queen Street at Linlithgow station on Saturday.
PC Christopher Sutherland, of the British Transport Police, said: “While they were travelling to Falkirk High they sang sectarian songs and acted in a threatening and abusive manner.
“There is no excuse for this sort of behaviour on public transport.
“This was a busy service and I am appealing for anyone who was on the train, or at either station and witnessed this unwelcome behaviour to come forward.
The only description of the men is that they were all under the age of 40.
Officers are reviewing CCTV from the train and the stations to try and identify those involved.