An explosion has ripped through an area near government buildings in Norway's capital. It is understood at least one people has been killed and there have been several injuries with eye witnesses talking of people covered in blood. The explosion was close to the Prime Minister Jens Stoltenberg's office. He is not in the capital at the moment.
State broadcaster NRK radio said two people were now confirmed dead, raising the initial toll from one.
Oslo lies to the south of Norway and the explosion happened in the heart of the city of half a million people.
Buildings have been left in a perilous state while its reported that many of the injuries were caused by flying glass.
The blast blew out most windows on the 17-storey building housing the prime minister's office, as well as nearby ministries including the oil ministry, which was on fire.
The cause is unknown and no group has claimed responsibility but the tangled wreckage of a car was outside one building and the damage appeared consistent with what security experts believe can be caused by car bombs.
