ATHENS, GREECE - JANUARY 12:  Police guard the entrance of the US Embassy in Athens after unknown assailants fired a rocket into the facility, causing damage to the building but no casualties, on January 12, 2007 in Athens, Greece. Police sources said the self-propelled explosive penetrated the building near the emblem at the front-entrance and exploded inside, damaging a toilet on the third floor. Police are investigating claims that a left-wing radical group is responsible. (Photo by Milos Bicanski/Getty Images)