People place flowers and light candles for condolence in Oslo, capital of Norway, July 23, 2011. At least 84 people were killed when a gunman disguised as a police officer opened fire at a youth camp on Utoeya island, about 40 km west of Oslo. The shootings occurred hours after a massive explosion ripped through a high-rise building housing the prime minister's office in Oslo, killing seven people. [Xinhua]