This screen shot taken on Wednesday, Dec. 4, 2013 in Mexico City, from the website of the National Commission on Nuclear Safety and Safeguards of Mexico's Energy Secretary, shows a message asking for help in the search for a stolen cargo truck hauling medical equipment with extremely dangerous radioactive material after it was stolen in Tepojaco, Hidalgo state, north of Mexico City. (AP Photo/website of the CNSNS)
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