On 4 June 1997, a bomb exploded outside the headquarters of the Bandidos Motorcycle Club chapter in Drammen, Norway, killing a passerby and injuring twenty-two others.

[2] Between thirty and fifty kilograms of explosives, made from a mixture of diesel and synthetic fertilizer, and a homemade fuse were placed inside a Volkswagen Transporter 1981 model by John Gerhard Berg, a member of the Screwdrivers Motorcycle Club.

On the night on 4 June 1997, Berg dressed in a black wig and other clothes he could dispose of, and drove the van into the entranceway of the Bandidos' Drammen clubhouse located at Konnerudgata 27 before lighting the bomb's fuse.

[3] Shock waves could be felt 500–600 meters away from the explosion site, severely damaging nearby buildings, including the Drammens Is factory.

[3] Irene Astrid Bækkevold, a fifty-one-year-old woman from Skjetten who was driving past the scene in her car, was killed in the bombing[5] and a total of twenty-two people were transported to hospital.

[1] As with the shooting of Jan Krogh Jensen north of Mjøndalen in July 1996, police suspect that the intended target of the blast was Hells Angel-turned-Bandido Michael Garcia "Lerche" Olsen.

Jagland vowed to propose legislation banning motorcycle gangs from establishing clubhouses in populated areas.

The resulting backlash from the public and increasing scrutiny on motorcycle gangs from law enforcement were among the factors that led to the end of the war, which officially ceased when the Bandidos and Hells Angels reached a truce in September 1997.

[8] The investigation into the bombing took four-and-a-half years to complete and seven people affiliated with the Hells Angels were indicted for the attack.

At Drammen District Court on 10 June 2002, John Gerhard Berg was sentenced to ten years in prison for arson and serious damage, while Torkjell Alsaker was acquitted.