Dortmund and Schalke hooligans clashed briefly at the Westfalenstadion after their Bundesliga match on Saturday.
FAR Rabat fans clashed with cops during their side’s match against RS Berkane on Wednesday.
Hajduk Split hooligans attacked members of the Bad Blue Boys outside a bar in Zagreb on Sunday afternoon.
Standard Liege’s clash against rivals Anderlecht was abandoned on Friday night because of flares thrown by away fans.
Ajax fans clashed with cops outside the Johan Cruyff Arena ahead of their match against Juventus on Wednesday.
A hand grenade was found at a building used by ADO Den Haag fans on Tuesday morning.