UEFA fined the Russian soccer federation (RFS) and threatened it with a possible six-point penalty as punishment for fan behavior at the European Championships.

European soccer's governing body slapped a 120,000 euro ($150,000) fine after supporters set off and threw fireworks during the Group A opener with the Czech Republic in Wroclaw. Police are also hunting Russian fans who attacked four volunteer stadium stewards after the match, following the broadcast of amateur video footage of a brawl inside the stadium.

There was no immediate response from the Russian federation but the national team was at the center of a highly charged match against old foe Poland in Warsaw on Tuesday, which took place against the backdrop of massive security. More than 180 supporters were detained after police used water cannon, tear gas and rubber bullets to disperse violent fans who clashed on the streets of Warsaw.

Police arrested 157 Poles and 24 Russians, as well as a Spaniard, a Hungarian and an Algerian. Ten police officers were treated for injuries, as well as 10 fans.