POLICE IN POZNAN arrested 14 people last night after violence broke out between groups of supporters in the Old Market district.
According to the online edition of the Polish newspaper Gazeta, the trouble erupted when two opposing groups began throwing bottles at each other, followed by chairs.
A police spoksman, Andrzej Borowiak, said the violence lasted around five minutes and quickly dissipated once riot police took up position.
A total of 14 people were arrested, ten Poles, a Croat and three Irish nationals.
There are no reports of any casualties during the disturbance.
The news follows reports that UEFA are set to take action after the improper conduct of Russian fans during their opening Group A game against the Czech Republic.