Oslo (dpa) - A large explosion hit central Oslo Friday, close to government offices, media reported.
"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.
Prime Minister Jens Stoltenberg was reported be unharmed, Norwegian news agency NTB reported.
Several people were injured but the extent of the injuries was not known.
The offices of newspaper VG in the vicinity were also evacuated.
Clouds of smoke were seen rising from the blast area, and police were trying to cordon off the area as a precaution should there be further explosions.
Prime Minister Jens Stoltenberg was reported be unharmed, Norwegian news agency NTB reported.
Several people were injured but the extent of the injuries was not known.
The offices of newspaper VG in the vicinity were also evacuated.
Clouds of smoke were seen rising from the blast area, and police were trying to cordon off the area as a precaution should there be further explosions.