Smoke billows from a building at the site of a powerful explosion that rocked central Oslo July 22, 2011. [Photo/Agencies] 

A passer-by comforts an injured woman after a powerful explosion 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. [Photo/Agencies]