Norway's Crown Prince Haakon (L) and Princess Astrid (C) are greeted by Bishop Ole Christian Kvarme as they arrive at Oslo Cathedral for a memorial concert for the victims of last week's deadly attacks on Norway, in Oslo on July 30, 2011. At least 77 were killed on July 22 in a bombing in central Oslo and a series of shootings at a Labour Party youth camp on Utoeya island just outside the capital. Norwegian far-right extremist Anders Behring Breivik has claimed responsibility for the crimes. AFP PHOTO / ODD ANDERSEN