CSKA Sofia hools caused problems at the third league match against Minyor Pernik.
Sonnenhof Großaspach's match with 1. FC Magdeburg was interrupted for several minutes on Saturday afternoon after away fans clashed with stewards.
Schalke fans clashed with Bayern Munich fans ahead of their Bundesliga match at Arena AufSchalke on Saturday evening.
Panathinaikos hooligans rioted both inside and outside the Apostolos Nikolaidis Stadium.
Los Andes fans clashed among themselves and police during the match.
During the Promień Żary vs. UKP Zielona Góra match on Saturday in Poland, home fans stormed the pitch and attempted to get to the away end.
Trouble between Plymouth Argyle and Millwall fans.
Ross Kemp travels to Poland to visit the Polish football hooligans who have become some of the most feared gangs in Europe.
Fakel Voronezh and Arsenal Tula hooligans clashed ahead of their FNL game at the Trade Unions Central Stadium in the city of Voronezh on 1st November.
Lokomotiv Moscow fans clashed with stewards and police inside the Atatürk Olympic Stadium during Thursday's Europa league match against Beşiktaş.
A Forest fan attacked a Derby County player at the end of the East Midlands derby.
Fenerbahçe fans clashed with Dutch riot police in the centre of Amsterdam ahead of their Europa League match against Ajax on Thursday.