At least 24 foreigners have been injured and more than 180 hooligans detained in clashes before and during a Euro 2012 match between Poland and Russia, officials said.
Fourteen Russians, one German, one American and one Pakistani were among the injured, a spokeswoman for Warsaw's ambulance service said.
The nationality of seven others was being established.
None was in life-threatening condition.
Government spokesman Pawel Gras said about 150 Poles and a few dozen Russians have been detained among a total of more than 180 people.
Police used water cannons, tear gas and rubber bullets on Tuesday to disperse fights between opposing fans and against the police in the Polish capital.
The match finished 1-1.