The four Americans aboard a yacht hijacked by pirates off the coast of Somalia are dead. Hijacked last Friday off Oman, the Quest was being piloted toward the Somali coast - and was being shadowed by a U.S. Navy warship. CBS News national security correspondent David Martin reports that gunshots aboard the yacht were heard, and the warship took action. All four Americans were dead, killed apparently by their captors. There were more than a dozen pirates on board, some dead and others captured, Martin reports. The Americans were Scott Adam and his wife, Jean, of Marina del Rey, Calif.; and Phyllis Macay and Bob Riggle, both of Seattle.
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