The incident is being investigated as serious public destruction, but the suspicions against the men concern a serious violation of the Act on Flammable and Explosive Goods.
They are currently suspected of handling the bomb, nothing more than that, prosecutor Elisabeth Anderson tells the newspaper.
All have previously been sentenced to prison for serious crimes, writes GP.
No one was injured by the powerful explosion that occurred on the night of December 5. A gate was damaged and several glass windows were shattered in the immediate area.
