A man puts flower tribute in front of the Embassy of Norway in Moscow, Russia, Saturday, July 23, 2011, in memory of the explosion and shooting victims. A homegrown terrorist set off the explosion that ripped open buildings in the heart of Norway's government, then according to reports he went to a summer camp dressed as a police officer and gunned down youths as they tried to escape the attack, police said Friday. (AP Photo/Mikhail Metzel)