On the night of 3 March 1940, an arson attack was made against the offices of Norrskensflamman in Luleå. The attack was the biggest political attack during the 1900s and considered a terrorist attack. Five persons were killed, including two children, and another five persons were injured. The newspaper's offices were completely destroyed. Responsible were Ebbe Hallberg, a landsfiskal, Uno Svanbom, a military captain, three other officers, as well as Gunnar Hedenström, a journalist from the right-wing newspaper Norrbottens-Kuriren). The attack was planned in the offices of Norrbottens-Kuriren.
The arson attack had financial support from Andreas Lindblom, manager of Skansen, and Paul Wretlind, chairman of the Stockholm section of the Liberal People's Party.