U.S., Britain say no early exit from Afghanistan

President Obama and Prime Minister David Cameron make a show of unity at the White House, as violence mars Defense Secretary Panetta's visit to Afghanistan.

President Obama and British Prime Minister David Cameron tried to project a clear and steady commitment to their strategy for the war in Afghanistan even as a possible attack at a U.S. base there during a visit by the secretary of Defense highlighted the country's tenuous hold on security.

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