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Armed police officers are seen on the island of Utoya, Norway Saturday, July 23, 2011. The 32-year-old man suspected in bomb and shooting attacks that killed at least 91 people in Norway bought six tons of fertilizer before the massacres, the supplier said Saturday as police investigated witness accounts of a second shooter. Norway's prime minister and royal family visited grieving relatives of the scores of youth gunned down in a horrific killing spree on an idyllic island retreat. A man who said he was carrying a knife was detained by police officers outside the hotel, as the shell-shocked Nordic nation was gripped by reports that Norwegian gunman may not have acted alone. (AP Photo/Matt Dunham)

Armed police officers are seen on the island of Utoya, Norway Saturday, July 23, 2011. The 32-year-old man suspected in bomb and shooting attacks that killed at least 91 people in Norway bought six tons of fertilizer before the massacres, the supplier said Saturday as police investigated witness accounts of a second shooter. Norway's prime minister and royal family visited grieving relatives of the scores of youth gunned down in a horrific killing spree on an idyllic island retreat. A man who said he was carrying a knife was detained by police officers outside the hotel, as the shell-shocked Nordic nation was gripped by reports that Norwegian gunman may not have acted alone. (AP Photo/Matt Dunham)

Norway Utoya Tragedy

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.