Many people were involved, and the police are still investigating, according to news agency TT.
"It's going to take some time before we have clarity on this," says Peter Eriksson with the police there.
Two youth gangs fought each other with a knife and machete. Two men, 19 and 20, along with a boy, 16, were arrested.
Four people were injured, according to police. One of these people sustained serious, but not life-threatening injuries.