AP Photo/TV2
In this image taken from video, smoke is seen billowing from a damaged building as debris is strewn across the street after an explosion in Oslo, Norway on Friday, July 22, 2011. A loud explosion shattered windows at the government's headquarters, which includes the prime minister's office. Government spokeswoman Camilla Ryste told The Associated Press that Prime Minister Jens Stoltenberg is safe, although it was unclear whether that meant he was uninjured.
AP Photo / Holm Morten
The scene after an explosion in Oslo, Norway, Friday July 22, 2011. At least two people were killed and several injured by the blast, which police confirmed was a bomb.
AP Photo / Holm Morten, Scanpix
People are treated at the scene after an explosion in Oslo, Norway, Friday July 22, 2011.
CBS
Views of the scene of an explosion in Oslo Friday, July 22, 2001. Witnesses said the sound of the explosion could be heard five kilometers away.
CBS
Views of the scene of an explosion in Oslo Friday, July 22, 2001.
Thomas Winje Aijord/AP Photo/Scanpix
A woman walks through debris in a street following an explosion in Oslo, Norway Friday July 22, 2011.
AP PHOTO / Berit Roald, Scanpix
Shattered windows of a major building after an explosion in Oslo, Norway, July 22, 2011.
AP PHOTO / Holm Morten, Scanpix
Emergency workers attend the scene as the building burns after a powerful explosion tore open several buildings in Oslo, Norway, Friday, July 22, 2011.
AP PHOTO/Aleksander Andersen, Scanpix
Smoke rises from buildings in Oslo, Norway, at the scene of a large explosion which tore apart several buildings Friday July 22, 2011.
AP PHOTO / Holm Morten, Scanpix
A detail of the devastation caused to a building in Oslo, Norway, after a powerful blast tore open several buildings, Friday July 22, 2011.
Thomas Winje/AFP/Getty Images
Police evacuate a wounded woman after an explosion near government buildings in Olso on July 22, 2011.
THOMAS WINJE OIJORD/AFP/Getty Images
People are treated at the scene after an explosion near the government buildings in Norway's capital Oslo on July 22, 2011.
THOMAS WINJE OIJORD/AFP/Getty Images
People are treated at the scene after an explosion near the government buildings in Norway's capital Oslo on July 22, 2011.
Thomas Winje/AFP/Getty Images
People make phone calls as they stand near a burning government building in Olso on July 22, 2011.
STRINGER/AFP/Getty Images
A damaged building in Oslo after a bomb exploded near government buildings July 22, 2011. Witnesses said the blast could be heard miles away.
AP Photo/Roald Berit, Scanpix
The wreckage of a car lies outside a building in the center of Oslo, Friday July 22, 2010, following an explosion that tore open several buildings including the prime minister's office, shattering windows and covering the street with documents.
AP Photo/Scanpix, Morten Holm
An injured woman is assisted from a damaged building in Oslo, Friday, July 22, 2011, after an explosion rocked the capital.
AP Photo/Morten Holm, Scanpix
An injured woman is helped by a passerby, following an explosion in Oslo, Norway, Friday, July 22, 2011.
AP Photo/Fartein Rudjord
Blood smears the pavement, as a victim is treated outside government buildings in the center of Oslo Friday, July 22, 2011.