One of those arrested has been deported to Denmark. According to police spokesman Mona Nordberg the man, who is aged 25, is wanted for “a serious crime”.
Four men aged 30 to 35 have been held on suspicion of weapons offences.
Police had been keeping the third anniversary party of the motorcycle club under close surveillance, with officers from Västra Götaland and the National Criminal Investigation Department, as well as police from Denmark and Norway involved in the operation.
At least 83 people, 23 cars and 32 motorcycles were checked throughout the evening.
The operation was part of the Swedish police’s ongoing fight against organised crime.