Penetrator bombs, commonly known as bunker busters, are stored on pallets at an ammunition plant in McAlester, Okla., in 2002. The U.S. sold 55 bunker busters to Israel in 2009, according to a recent Newsweek report. Sue Ogrocki/AP hide caption

itoggle caption Sue Ogrocki/AP

U.S. Secretary of State Hillary Clinton shakes hands with Egypt's Foreign Minister Mohammed Kamel Amr during a joint press conference in Washington on Wednesday. Amr sought to assure the U.S. that Egypt is moving toward democracy. Saul Loeb/AFP/Getty Images hide caption

itoggle caption Saul Loeb/AFP/Getty Images