Traces of the poison ricin have been found at a railway station in Paris, according to the French interior ministry. Two vials of the potentially deadly substance were found inside a locker at the Gare de Lyon, according to ministry officials. Ricin, a toxin found in castor beans, can be fatal when inhaled or ingested. The substance is 6,000 times more powerful than cyanide and has been used in the past as a bio-weapon. In January, police in the UK discovered a stash of ricin during a raid on a flat in London. Three men were charged with plotting to produce chemical weapons in relation to the incident. Full Story