UPDATE: The London Ricin was homemade, so any news outlet that reports this "connection" with a straight face should be ashamed of themselves. That never stops them, of course.
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Castor oil beans - from which ricin is made - and equipment and containers for crushing the beans were found at a flat in Wood Green, north London, where one of the men was arrested.
Police said forensic analysis of the address - where a small quantity of material tested positive as ricin - was continuing, although they do believe the poison was made there.
(thanks Spike)