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Ricin Police in London have arrested six men of North African origin after finding traces of the deadly poison, ricin, at a North London address. As NPR's Richard Harris reports, ricin is lethal, relatively easy to manufacture, and is on the list of potential bioweapons that terrorists might employ.

Ricin

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Ricin

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Police in London have arrested six men of North African origin after finding traces of the deadly poison, ricin, at a North London address. As NPR's Richard Harris reports, ricin is lethal, relatively easy to manufacture, and is on the list of potential bioweapons that terrorists might employ.