More than 1,000 young activists gathered on Friday on the Norwegian island of Utoya for the official opening of their political party's summer camp, the first meeting there since a right-wing gunman killed 69 people in a rampage four years ago."It's good to be home again at Utoya," the president of the center-left Labor Party youth organization, Mani Hussaini, told a crowd sitting on a hill.Some of the youths had crossed in the same ferry that took Anders Behring-Breivik, disguised as a policeman, to the island in July 2011 after he earlier had set off a car bomb outside the prime minister's office in the center of Oslo. The bomb killed eight people.The killings were the worst atrocity in Norway since World War Two, traumatizing a nation that prides itself on its reputation for peace and safety."All the things we had to go through and all the tough days. But this day will also be a part of Utoya's history," the Syrian-born Hussaini said from the stage to loud applause.Small signs dot the island with names of victims engraved on steel plates fixed to trees.