Police in Cumbria are investigating after two men gate crashed a community carnival dressed as members of the Ku Klux Klan.
The pair turned up to the fun day in Wigton dressed in the recognised white gowns and hoods used by Klan members.
Cumbria Police said their investigation was to discover whether any race hate laws had been breached.
A spokesman for the Wigton carnival committee said that the men's attire was "unacceptable"
The Cumbria Police spokesman said although no official complaint had been received it was thought appropriate to investigate the incident which occurred on Saturday.
Supt Kevin McGilloway said: "West Cumbria Police have been made aware that there is television footage of two individuals possibly dressed as members of the Ku Klux Klan during the parade at Wigton Carnival on Saturday.
"Whilst the police did not receive any complaint on the day of the carnival about this matter, we are studying any material provided to us to identify if any offences have been committed.
"If offences have been committed, we will take any action that is appropriate in the circumstances."
Paul Radcliffe, a member of the carnival group committee, said: "The individuals were not part of the official carnival parade. They came out of a pub and joined in.
"We don't know who they are and we don't condone their insensitive and inappropriate actions."
He said stewarding would be stepped up at future events.