This saddens me greatly:
"Norwegian police have said that explosions in Oslo this afternoon were caused by bombs, and have caused "deaths and injuries."
Police said there were "one or several powerful explosions in the government building in Oslo."
They have told people in the Norwegian capital to stay away from the city centre and limit the use of mobile phones.
The building housed the offices of the Prime Minister, who was not thought to have been in his office at the time, and was reported to be safe.
The explosion was also thought to be near Norway's biggest tabloid newspaper.
Journalist Asgeir Ueland said that Oslo is a popular destination for people from other parts of Norway. He said the streets were crowded: "It happened when people were packing up for the weekend and leaving their offices. There were lots of people with blood on their faces and severe cuts."
Craig Barnes is in Oslo and said that he is shocked at what has happened. "It is a very nice, safe place to live. Norwegians are very friendly and I think everyone gets on. I think this is going to change a lot of views now. There will be questions regarding safety."
Nearby offices in the Norwegian capital have been evacuated.
Large amounts of glass and metal have been seen in the street.
Police and fire officials have declined to comment on the cause of the explosion.
The wreckage of a car was seen outside one building and there was early speculation that the damage was consistent with that from a car bomb.
One radio journalist reported from the scene. "I see that some windows of the government headquarters have been broken. Some people covered with blood are lying in the street."
Norway has experienced problems with several homegrown terror plots linked to al Qaeda.
Last week, a Norwegian prosecutor filed terror charges against an Iraqi-born cleric for threatening Norwegian politicians with death if he was deported."
[UPDATE 08/19/11: The shooter, as most of us now know, has been identified as Norwegian extremist, Anders Behring Breivik.]