Police guard handcuffed men after they arrested them prior to the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. Russian soccer fans clashed with police and Poland supporters in separate incidents in Warsaw on Tuesday, just hours before the two teams were to meet in an emotionally charged European Championship match. Several people were injured. (AP Photo/Gero Breloer)

Fans run for cover as a stone is thrown on them prior to the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Gero Breloer)

Russian fans arrive under heavy security prior to the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Gero Breloer)

A handcuffed Polish fan lies flat on the street prior to the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Gero Breloer)

A masked fan walks past a toppled fridge at the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Gero Breloer)

Fans clash prior to the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Gero Breloer)

Police arrest soccer fans prior to the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Gero Breloer)

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

Police arrive at the site of clashes between fans prior to the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Gero Breloer)

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

Russia supporters unfurl a giant banner before the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Michael Sohn)

Polish fans hold up their scarves and cheer before the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Matt Dunham)

Poland's Jakub Blaszczykowski, left, and Russia's Sergei Ignashevich challenge for the ball during the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Sergey Ponomarev)

Russia's Roman Shirokov, center, argues with Poland's, from left, Jakub Blaszczykowski, Rafal Murawski, Damien Perquis and Dariusz Dudka during the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Gero Breloer)

Polish police walk onto the pitch after the Euro 2012 soccer championship Group A match between Poland and Russia in Warsaw, Poland, Tuesday, June 12, 2012. (AP Photo/Matt Dunham)