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An instrument for detecting radiation is seen on a map of the New York area during an exercise to intercept radioactive "dirty bombs" in waterways near New York, Thursday, April 7, 2011. Dirty bombs have long been feared as a potential weapon of terrorists because their main objective is to sow panic, confusion and anxiety by hurling radioactive dust and smoke into the atmosphere. (AP Photo/Seth Wenig, File)

An instrument for detecting radiation is seen on a map of the New York area during an exercise to intercept radioactive "dirty bombs" in waterways near New York, Thursday, April 7, 2011. Dirty bombs have long been feared as a potential weapon of terrorists because their main objective is to sow panic, confusion and anxiety by hurling radioactive dust and smoke into the atmosphere. (AP Photo/Seth Wenig, File)

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