The second attack occurred less than two hours later at a summer camp on the island of Utøya in Tyrifjorden , Buskerud . The camp was organized by the AUF , the youth division of the ruling Norwegian Labour Party ( AP ) .
The second attack was about 90 minutes later , at a youth camp organized by the youth group ( AUF ) of the Norwegian Labour Party ( AP ) at the island of Utøya in Tyrifjorden , Buskerud .