SUNDVOLLEN, Norway (AP) — The Norwegian man suspected in a bombing and shooting spree that killed at least 92 people bought six tons of fertilizer before the massacre, the supplier said Saturday as police investigated witness accounts of a second shooter. Norway's royal family and prime minister led the nation in mourning, visiting grieving relatives of the scores of youth gunned down at an island retreat, as the shell-shocked Nordic nation was gripped by reports that the gunman may not have acted alone. The shooting spree began just hours after a massive explosion that ripped through an Oslo high-rise building housing the prime minister's office.