On 8 January 2023, German police arrested two Iranians in the town of Castrop-Rauxel in North-Rhine Westphalia on suspicion of plotting a terrorist attack using ricin and cyanide. This is the second plot in Germany in five years that involved the alleged intent to use ricin after the 2018 Cologne ricin plot. Ricin is a plant-based toxin extracted from castor oil beans. It is categorized as a bioweapon that is deadly even in small quantities if injected, inhaled, swallowed, or spread on the skin. Cyanide is a chemical agent that is particularly lethal if inhaled or ingested in minute doses.