The Party of the Swedes had called an information meeting for new members and those curious about the party on Thursday via its homepage.
Some ten party members had gathered by Halmstad train station at around 6.30pm when they left in cars but soon returned, according to the local Hallands Posten.
On their return they attacked a group of anti-fascist activists. Several of the SvP members were armed with weapons including knives, crow-bars and an axe.
According to a Hallands Posten reporter who was at the scene party leader Stefan Jacobsson was armed with a cudgel.
The police arrived shortly afterwards and found that one of the anti-fascists had been stabbed in the shoulder. None of the group however filed a complaint.
“One of the left wing group was stabbed in the shoulder but none of those involved have reported anything about the incident,” said Johan Johansson at Halmstad police to the newspaper.
Two suspects have however been identified and several weapons were seized at the scene.
According to a statement on the SvP website the attack was prompted when the anti-fascists began filming the meeting, speculating that the intention had been to “identify and register the opinions of participants”.
The party said that a group of participants decided to “protect themselves by counter-attacking” the anti-fascists after they began chanting.