On June 13, a Tunisian in Cologne, Germany was arrested for plotting an attack using the biological/chemical agent ricin. See below for more details on the case thus far from a Jihadology post:
June 13, 2018
Cologne police arrest Tunisian man on suspicion of possessing toxic substance – The Local
June 14, 2018
Giftfund in Köln: Haftbefehl gegen Terrorverdächtigen – Tagesschau
Germany: Man charged with producing biological weapon at home in Cologne – DW
Ermittler in Köln: Verdächtiger soll ‘biologische Waffen’ hergestellt haben – WELT
tunisianjihadism.com 
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