At least 80 people have been killed in a shooting at Utoya Island, nearly two hours after a bomb blast killed seven people in the government district of the capital Oslo.
A gunman dressed in police uniform opened fire at a youth summer camp organised by the ruling Labour party at the island, just outside Oslo.
Norway's public broadcaster, NRK, named the bombing and shooting suspect as Anders Behring Breivik.
The TV2 television station reported, without disclosing its sources, that the detained man had links to right-wing extremism. He was described as a tall blonde man.
Source: Al Jazeera and agencies