A picture taken on July 23, 2011 shows flowers outside Oslo Cathedral where people pay their respect to victims of the July 22 twin attacks on a youth camp and the government headquarters that killed 91 people in Norway's deadliest post-war tragedy. Police said they were questioning a right-wing Christian on Saturday over the twin attacks on a youth camp and the government headquarters. As harrowing testimony emerged from the holiday island where scores of youngsters were mown down by a gunman posing as a policeman, Norway's premier said the country would emerge stronger from the "cruel act of violence". AFP PHOTO / SCANPIX NORWAY / Berit Roald NORWAY OUT