Question: How many participants did the person who shot Adrian Pracon kill at a summer camp?
Sentence (from "Anders Behring Breivik"): On 22 July 2011 he killed eight people by detonating a van bomb amid Regjeringskvartalet in Oslo, then shot dead 69 participants of a Workers' Youth League (AUF) summer camp on the island of Utøya.
Relevant evidence: Yes