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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.

Copyright 2003 NPR

Award-winning journalist Richard Harris has reported on a wide range of topics in science, medicine and the environment since he joined NPR in 1986. In early 2014, his focus shifted from an emphasis on climate change and the environment to biomedical research.