13 / 15
Flowers are laid down outside Oslo Cathedral, Oslo Saturday July 23, 2011, in memory of the victims of Friday's twin attack in Oslo and island of Utoya. A Norwegian gunman disguised as a police officer beckoned his victims closer before shooting them one by one, claiming at least 84 lives, in a horrific killing spree on an idyllic island teeming with youths that has left this peaceful Nordic nation in mourning. The island tragedy Friday unfolded hours after a massive explosion ripped through a high-rise building housing the prime minister's office, killing seven people.(AP Photo/Scanpix/Berit Roald)

Norway Utoya Tragedy

January 1, 1970

The attack happened on July 22 2011. At least 84 people were killed in a shooting at a Labour Party youth camp on the Norway Utoya island.