Here, we choose the most memorable fan fights of the 2010s.
Take a look back at some of the most interesting and memorable moments of the year 2019.
Six Lazio fans were attacked by Cagliari hooligans ahead of their Serie A clash at the Sardegna Arena on Monday.
Real Zaragoza and Racing Santander fans clashed ahead of their Segunda Division match on Saturday.
PSG and Galatasaray fans clashed in the French capital ahead of the teams' Champions League meeting at the Parc des Princes on Wednesday.
Two Blackpool fans attacked a Fleetwood Town supporter on the pitch during their League One clash at Bloomfield Road on Saturday.
Wolverhampton Wanderers fans were attacked by a group of Standard Liege hooligans in the Portuguese city of Porto on Tuesday night.
Flamengo fans celebrating their side's triumph in the Copa Libertadores clashed with riot police on the streets of Rio de Janeiro on Sunday.
Wydad fans couldn't contain their anger after their side were knocked out of the Arab Club Champions Cup by city rivals Raja on Saturday.
Fighting broke out between rival fans in the stands following a Brazilian top-flight match between Cruzeiro and Atletico Mineiro on Sunday.
Celtic fans were attacked outside a pub in Rome ahead of their side's Europa League meeting against Lazio on Thursday night.
Karpaty Lviv and St. Etienne hools clashed in a mass fight in the western Ukrainian city of Lviv on Wednesday night ahead of the French side's match against Oleksandriya in the Europa League.