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Polish riot police detain a soccer fan prior to the Euro 2012 Group A soccer match between Poland and Russia in Warsaw, Poland , Tuesday, June 12, 2012. (AP Photo/Czarek Sokolowski)

Euro fans clash with police

Police used tear gas and water cannon against brawling football fans in Warsaw on June 12 as Poland geared up to play old foe Russia in a key Euro 2012 duel.