NPR's Sylvia Poggioli reports that under an agreement signed recently by the United States and Italy, American art dealers and collectors must now prove that Italian antiquities they import have not been looted or stolen. Archeologists say stolen Italian artifacts have been supplying the art market for more than two centuries. Italian investigators have tracked down ancient Greek treasures looted from Morgantina, in central Sicily, to Manhattan and they are negotiating for their return.
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