People affected by the tragedy mourn during a memorial service in Norderhov, Norway, Sunday, July 24, 2011. A Norwegian man dressed as a police officer gunned down at least 84 people at an island youth retreat on Friday before being arrested. Investigators are still searching the surrounding waters, where people fled the attack. The same man is believed to have been responsible for an explosion in nearby Oslo that killed seven. (AP Photo/Frank Augstein)