Late in the afternoon the 19-year-old woman was found bound with duct tape in a stairwell of the apartment block where she lives with Martin Kinnunen, chairman of the youth wing of the far-right Sweden Democrats.
The woman was taken to hospital but did not have any serious physical injuries and was able to return home during the evening.
Martin Kinnunen told news agency TT that his girlfriend was still shocked after the day’s events.
Earlier in the day three men had forced their way into the couple’s apartment and held the 19-year-old at knife point. She was bound with duct tape and taken out to the stairwell before the men left the scene.
Martin Kinnunen is convinced that the threat was in fact directed at him.
“In recent weeks we have received a lot of threats. There have been strange phone calls and we have seen people outside our apartment late at night,” he said.
“They also told her that I should watch out. Otherwise something much worse would happen in the future.”
According to the police, Kinnunen has previously reported threats made against him.
“We can’t rule out that there was a political motive,” said spokesman Björn Engström.