ATHENS, Greece, Jan 12, SPA -- The U.S. Embassy in Athens was hit by a rocket-propelled grenade Friday morning, said top metropolitan police officer Asimakis Golfis. U.S. Ambassador Charles Ries said the explosion injured no one and caused minimal damage, but was still being treated as a "very serious attack," according to a report of CNN. The entire compound in downtown Athens is a crime scene, he told reporters. Greek counterterrorism authorities and U.S. officials are working to uncover who is behind the attack, Ries said. U.S. and Greek officials immediately began inspecting the area and nearby buildings for clues."There can be no justification for such a senseless act of violence," Ries said.--SPA www.spa.gov.sa/417407