Pre-game warm up: FEMEN activists strip in protest against Euro 2012 (PHOTOS, VIDEO)

The controversial Ukrainian feminist movement FEMEN has staged a nude protest against the Euro 2012 championship in front of Warsaw's National Stadium. Within minutes, all four protesters, armed with fire extinguishers, were arrested.

The incident took place a few hours before the match between Poland and Greece on Friday. The women appeared in front of the stadium half-naked, with protest signs on their bodies, chanting vulgar slogans about the sporting event. 

The FEMEN girls ran through crowds of fans, showering foam from fire extinguishers everywhere.­

FEMEN opposes Euro 2012 because of the fears that the tournament will lead to an increase in prostitution. 

Earlier in May the infamous group attacked the Euro Cup, which is awarded to the winner of the European Football Championship, during its display in the Ukrainian city of Dnepropetrovsk ahead of the Euro 2012 kickoff. A similar incident took place on May 12 in Kiev, when the activists pounced on the trophy.

AFP Photo / Janek Skarzynski
AFP Photo / Janek Skarzynski
AFP Photo / Janek Skarzynski
AFP Photo / Janek Skarzynski
AFP Photo / Janek Skarzynski
AFP Photo / Janek Skarzynski
AFP Photo / Janek Skarzynski
AFP Photo / Janek Skarzynski
AFP Photo / Janek Skarzynski
AFP Photo / Janek Skarzynski