A rally by the English Defence League in Stoke-on-Trent has so far cost almost £200,000 to police, a BBC Freedom of Information request found.
About 1,500 EDL supporters in Hanley protested against Islamic extremism last month. A counter-protest was held by the Unite Against Fascism campaign.
The event cost Staffordshire Police £196,631. Most was to pay for support units from neighbouring police forces.
Overtime claims are still being processed. There were 17 arrests.
More than 600 officers were employed to ensure safety at the event.
Three people who were arrested were later charged with racially or religiously aggravated disorder offences. Two pleaded guilty and were fined and a third is on bail awaiting trial.
The figures were provided after a Freedom of Information (FOI) request from BBC Radio Stoke.
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