A police official, Andrzej Borowiak, said police detained 10 Poles, three Irish fans and one Croat, and were still trying to determine what role they had in the fight.
Video footage showed chairs toppled on the square and police arriving in force to make arrests.
Ireland and Croatia meet for their first Group C match at Euro 2012 later Sunday.
The violence comes after Russia fans attacked stadium stewards Friday night in Wroclaw.
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Rank | Team | W/D/L | Pts |
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Cities & Stadiums
The Top 3 Teams of Previous Tournaments
Year | Winners | Runner-up | Third place |
---|---|---|---|
2008 | Spain | Germany | Russia / Turkey |
2004 | Greece | Portugal | Netherlands / Czech Republic |
2000 | France | Italy | Netherlands / Portugal |
1996 | Germany | Czech Republic | France / England |
1992 | Denmark | Germany | Netherlands / Sweden |
1988 | Netherlands | Soviet Union | Italy / West Germany |
1984 | France | Spain | Denmark / Portugal |
1980 | West Germany | Belgium | Czechoslovakia |
1976 | Czechoslovakia | West Germany | Netherlands |
1972 | West Germany | Soviet Union | Belgium |
1968 | Italy | Yugoslavia | England |
1964 | Spain | Soviet Union | Hungary |
1960 | Soviet Union | Yugoslavia | Czechoslovakia |