Take a look at some of the most memorable moments that happened inside the world of football hooligans in 2016.
Dynamo Kyiv and Beşiktaş hooligans clashed before and during their Champions League match on Tuesday.
Peñarol hooligans clashed with police both inside and outside the Estadio Centenario.
Greuther Fürth and Nürnberg hooligans were involved in a mass street brawl this afternoon after an A-Junioren Bundesliga South match.
A group of Helsingborgs hooligans stormed the pitch after their team lost to Halmstads.
Romania and Poland fans briefly clashed in the stands during their World Cup qualifying match on Friday.
OFK Beograd and FK Zemun fans clashed at the Omladinski Stadium on Saturday during their Serbian First League match.
IFK Göteborg and AIK hooligans clashed near a pub in Gothenburg city centre on Sunday afternoon.
Corinthians fans fought with police in the stands before kick-off.
Legia fans clashed with Spanish riot police ahead of their Champions League meeting with Real Madrid on Tuesday.
PAOK and Iraklis fans clashed in the streets of Thessaloniki on Sunday.
Torpedo Vladimir and Tekstilshchik Ivanovo fans clashed on the pitch during the half-time break of their Russian Second Division match on Monday.