ATHENS, Greece — Police say 18 people believed to be supporters of Dynamo Kiev have been detained for questioning after a bar in central Athens was damaged ahead of a Europa League game between the Ukrainian team and local club AEK.

The incident occurred on Thursday, hours before the match at Athens’ Olympic Stadium.

Police are on alert after a Greek anarchist group urged Greek football fans to confront what it described as groups of neo-Nazis among the traveling fans.

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