Oslo (dpa) - At least one person was killed in the major explosion which rocked government and media buildings in central Oslo Friday, local media reported.
Several people were also injured. Witnesses said some were bleeding, suggesting they had been injured by flying glass, public broadcaster NRK said.
The blast damaged the facade of the government offices, including blowing out windows and the front of the 17-storey building that houses the prime minister's offices. Nearby ministries were also hit.
Prime Minister Jens Stoltenberg was reported be unharmed, Norwegian news agency NTB reported.
Police were not immediately available for comment on the cause of the blast. Debris including broken glass littered nearby streets. A mangled car could be seen in front of the tower block.
"The whole building shook. We thought it was an earthquake," said a reporter with public broadcaster NRK who was near the scene when the blast occurred.
The offices of newspaper VG in the vicinity were also evacuated.