An injured woman is helped by a man at the scene of a powerful explosion that rocked central Oslo July 22, 2011. A huge explosion damaged government buildings in central Oslo on Friday including Prime Minister Jens Stoltenberg’s office, injuring several people, a Reuters witness said. The blast blew out most windows on the 17-storey building housing Stoltenberg’s office, as well as nearby ministries including the oil ministry, which was on fire. (REUTERS/Morten Holm/Scanpix)

People give phone calls as they stand near a burning government building in Olso on July 22, 2011. (Thomas Winje/AFP/Getty Images)

A view shows the aftermath of a blast on a street in Oslo July 22, 2011. A bomb ripped through Oslo’s central government district on Friday killing seven people, police said, and hours later a gunman opened fire at a youth camp on a nearby island. (REUTERS / Fartein Rudjord)

Rescue workers work at the site of a powerful explosion that rocked central Oslo July 22, 2011. A huge explosion damaged government buildings in central Oslo on Friday including Prime Minister Jens Stoltenberg’s office, injuring several people, a Reuters witness said. The blast blew out most windows on the 17-storey building housing Stoltenberg’s office, as well as nearby ministries including the oil ministry, which was on fire. (REUTERS / Thomas Winje Oijord/Scanpix)

A picture taken on July 22, 2011 shows a police tape in a street of Oslo after an explosion near government buildings. (Audun Braastad/AFP/Getty Images)

Debris is seen on the street after a powerful explosion rocked central Oslo July 22, 2011. (REUTERS/Holm Morten/Scanpix)

Emergency services are seen on Utoeya island after a shooting took place at a meeting of the youth wing of Norway’s ruling Labour Party, July 22, 2011. A bomb ripped through Oslo’s central government district on Friday and a gunman dressed as a policeman then opened fire at a youth camp on a nearby island, killing at least 17 people altogether. (REUTERS / Truls Brekke)

People are seen on the bank of the Utoeya island after a shooting took place at a meeting of the youth wing of Norway’s ruling Labour Party, July 22, 2011. It was unclear whether the people were hiding or dead. (REUTERS/Vegard M. Aas/Presse30 )

A wounded woman is brought ashore opposite Utaoya island (in the distance) after being rescued from a gunman who went on a killing rampage targeting participants in a Norwegian Labour Party youth organisation event on the island, some 40 km southwest of Oslo, on July 22 , 2011. At least 17 were killed in Friday’s attacks in Norway, a bombing in central Oslo and a series of shootings on the island, and the figure could rise, a senior police officer said. Police had also found explosives on the island of Utoeya, where a gunman opened fire on young people at a summer camp organised by the ruling Labour Party, Sveinung Sponheim, acting commissioner for Oslo police, told reporters. (Svein Gustav Wilhelmsen/AFP/Getty Images)

Pictured is an aerial view of Olso’s city centre shortly after an explosion rocked the Norwegian capital on July 22, 2011. Militants staged twin bomb and shooting attacks in Norway Friday, leaving at least 11 dead as a blast tore through government buildings and a gunman opened fire at a youth meeting of the ruling party. Many were also reported wounded from the bomb blast in central Oslo and the shooting at a summer school meeting of Prime Minister Jens Stoltenberg’s ruling Labour Party outside the capital. (JON BREDO OVERAAS/AFP/Getty Images)

A view shows the aftermath of a blast on a street in Oslo July 22, 2011. A bomb ripped through Oslo’s central government district on Friday killing seven people, police said, and hours later a gunman opened fire at a youth camp on a nearby island. (REUTERS/Fartein Rudjord)

Two women are seen leaving as rescue workers arrive to evacuate the injured at the site of a powerful explosion that rocked central Oslo July 22, 2011. A huge explosion damaged government buildings in central Oslo on Friday including Prime Minister Jens Stoltenberg’s office, injuring several people, a Reuters witness said. The blast blew out most windows on the 17-storey building housing Stoltenberg’s office, as well as nearby ministries including the oil ministry, which was on fire. (REUTERS / Thomas Winje Oijord/Scanpix)

A view shows the aftermath of a blast on a street in Oslo July 22, 2011. A bomb ripped through Oslo’s central government district on Friday killing seven people, police said, and hours later a gunman opened fire at a youth camp on a nearby island. (REUTERS / Fartein Rudjord)

Police officers evacuate a wounded woman at the site of a powerful explosion that rocked central Oslo July 22, 2011. A huge explosion damaged government buildings in central Oslo on Friday including Prime Minister Jens Stoltenberg’s office, injuring several people, a Reuters witness said. The blast blew out most windows on the 17-storey building housing Stoltenberg’s office, as well as nearby ministries including the oil ministry, which was on fire. (REUTERS / Thomas Winje Oijord/Scanpix)

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)

Rescue officials tend to a wounded man after a powerful explosion rocked central Oslo July 22, 2011. (REUTERS/Holm Morten/Scanpix)

Photo taken on July 22, 2011 shows the shattered windows of a government building following an explosion in Norway’s capital Oslo. (Aleksander andersen/AFP/Getty Images)