An arrow is left in a wall where a gunman with a bow killed several people in Kongsberg. King: Norway 'stand with you ' King Harald of Norway expressed his sympathies on Thursday in a short message to the mayor of Kongsberg, saying the rest of the nation is with you. We sympathize with the loved ones and the injured in grief and despair, he said. And we think of all those affected in Kongsberg who have experienced that their safe local environment has suddenly become a dangerous place. It shakes us all when horrible things happen nearof us, when you least expect it, in the midst of everyday life on the open street. The attack comes just over a decade after Norway's worst terrorist attack. In July 2011, a Norwegian far-right extremist Anders Behring Brevik killed 77 people, many of them teenagers, in a bombing and rampage He was sentenced to 21 years in prison, the maximum possible sentence. In August 2019, another man stormed an Oslo mosque armed with rifles before being overpowered. In that year, the country's intelligence services reported that right-wing terrorism was on the increase around the world and warned that the country would likely be targeted in the near future. CNN 's Vasco Cotovio, Seb Shukla and Lianne Kolirin contributed to this report.