What happened
On 22 July 2011, a bomb attack in Oslo was followed by a mass shooting at a youth camp on Utøya, killing 77 people in total.
The investigation
The attacker surrendered on Utøya and investigators reconstructed extensive preparation, extremist writings, weapons acquisition and the sequence of both attacks.
What the courts or investigators concluded
Anders Behring Breivik was convicted of terrorism and murder and sentenced to preventive detention, a form of sentence that can be extended while a person remains dangerous.
Why the case remains significant
The attacks permanently changed Norwegian discussions of extremism, emergency response, public security and the responsibility to remember victims without turning the perpetrator into the center of the story.
Case context
Crime by Region organizes cases geographically so readers can move from one file to other investigations from the same country. For unresolved or contested cases, the wording above reflects the distinction between confirmed events, investigative theories and findings actually established in court.