Police are appealing for witnesses following an incident on a London-Edinburgh train.
The call comes following a disturbance on board the 1630 train from Kings Cross on Sunday, June 17.
PC Harry Thompson, of British Transport Police, said: "The East Coast service was delayed at York following a number of complaints about the behaviour of a group of passengers in coach D.
"The group included adult males and females who were sitting in the middle of the coach on both sides of the carriage and had hung Union Flags above them.
"I am appealing for anyone who was on board and saw or heard what happened to contact BTP in confidence."
When the train arrived at York, three men, aged 41, 47 and 52, and a 48-year-old woman, all from the Edinburgh area, were arrested on suspicion of a public order offence. All four were released on police bail until 15 July, pending further enquiries.
Anyone with information is asked to contact British Transport Police on 0800 40 50 40 or Crimestoppers on 0800 555 111. Please quote incident number B14/NEA of 20/06/2012
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