This image released by Saharareporters shows debris after a large explosion struck the United Nations' main office in Nigeria's capital Abuja, Friday, Aug. 26, 2011, flattening one wing of the building and killing several people. A U.N. official in Geneva called it a bomb attack. The building, located in the same neighborhood as the U.S. embassy and other diplomatic posts in Abuja, had a huge hole punched in it. (AP Photo/Saharareporters)