Russian hooligans assault stadium security guards
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One steward was wrestled to the ground and repeatedly kicked by the group of men, including one who was shirtless.
Another security guard attempted to intervene, but he was punched by the same shirtless man, then kicked in the head by another fan.
"After the Russia-Czech Republic match a fight broke out," Marcin Herra, the head of the Polish company in charge of coordinating the Euro 2012, told TVP INFO.
"A large number of fans in Russia T-shirts attacked security guards then ran away. Four guards were hospitalised but soon released after receiving first aid."
Meanwhile in Lviv, a fight broke out between about 10 supporters of Russia and Ukraine outside the football fan zone in the early hours of Saturday.
Russian fans, delighted at their side's impressive win in the Group A opener, left the zone and started shouting and swearing at a smaller group of Ukrainians.
The two sides exchanged a few punches before local police intervened to stop the fight.
Tensions between the two ex-Soviet neighbors are particularly high in Lviv, in the far west of the country, in part because of Ukrainian resentment at Soviet rule from 1939 to 1991.
The Lviv region was the centre of a resistance campaign by Ukrainian nationalists fighting for independence from the Soviet Union during and after the second world war.