A Polish supporter walks in front of riot police standing in front of the entrance of the national stadium in Warsaw, Poland, ahead the Euro 2012 soccer championships Group A match between Poland and Russia on June 12. Brawls erupted between Polish and Russian soccer fans as thousands of Russians marched toward Warsaw's national stadium hours before the countries face off in a key Euro 2012 match. Police fired tear gas and water cannon on unruly fans and arrested several people. (Christof Stache/AFP/Getty Images) #