Fighting broke out between rival sets of Tirana and Partizani fans inside the Selman Stermasi Stadium before the start of their derby match on Sunday.
Widzew Lodz’s Polish cup match against Slask Wroclaw was stopped for several minutes on Tuesday after trouble broke out in the away end.
Wednesday’s Bulgarian cup match between Spartak Varna and Levski Sofia was stopped for several minutes due to trouble in the stands.
A brawl between fans of ASU Poli and Dinamo Bucharest erupted in the western Romanian city of Timisoara on Tuesday morning.
Crvena Zvezda fans clashed with riot cops inside the Partizan Stadium prior to the kick-off of Sunday’s Belgrade derby.