An independent inquiry has determined that Norwegian police were too slow to investigate and capture mass killer Anders Behring Breivik and that they could have prevented the bombings in Oslo.

Last summer, Breivik killed 77 people in a camp on Utoeya island and wounded 240 others in a bombing in central Oslo – acts that left Norway in a state of shock.

Breivik, who claims he committed these atrocities as an expression against Muslim immigration to Norway, faces sentencing on Aug. 24.