A soldier stands guard at the site of a bomb blast in Oslo, July 23, 2011. Friday's killing began when a bomb exploded in downtown Oslo near government offices, killing seven people and injuring more than 19 others. Hours later, a gunman dressed in a police uniform opened fire at a youth camp run by Norway's ruling political party on Utoya, an island south of Oslo, killing at least 85 people. [Xinhua]