Clashes between Atromitos and AEK fans after the end of the game.
Cartagines and Herediano fans clashed in the stands during their Primera Division match on Thursday.
A large group of Spartak Moscow and CSKA Moscow hooligans clashed in a mass brawl on the streets of the Russian capital yesterday.
Sao Paulo fans clashed with police during an Under-20 match at the Nogueirao stadium in Mogi das Cruzes on Sunday.
AIK and Djurgarden hooligans clashed in a pre-arranged fight in one of the streets of Stockholm on Saturday.
Galatasaray fans attacked a bus with Karşıyaka fans on the highway in Istanbul.
Fans of Morocco's Wydad Casablanca clashed with police inside the Mohammed V stadium after their match against arch-rivals Raja on Saturday.
Vardar fans clashed with police in the first half of the match.
Partizan hooligans pinched some flags belonging to Augsburg fans during Thursday's Europa League match in Belgrade.
Irate Levski fans clashed with riot police after a defeat of their team.
Santiago Wanderers and Colo-Colo fans clashed at the Elias Figueroa Brander stadium before their Primera Division match on Sunday.
Trouble flared at the end of Sunday's game between Lugano and Grasshoppers when supporters came on to the pitch.