At least 10 people were injured on Saturday when supporters of Budapest football club Honved clashed with fans of Austria's Sturm Graz during a match in the Hungarian capital.
While Sturm Graz qualified for the Intertoto Cup during the 3rd round after winning 0-0, and then 2-1 late Saturday in Budapest, rival supporters clashed throughout the day. Police detained an Austrian man after he damaged a police car.
During the match, Austrian supporters threw smoke bombs in the stadium where the two clubs faced off.
Sturm Graz chief Hans Rinner said he regretted the use of the devices by supporters of his club, but added Honved Budapest stewards had "clamped down brutally" on thousands of Austrians.
Some stewards used batons and ripped out seats only to throw them at Austrian supporters, he added.
About 10 Graz supporters were taken to hospital, he said.