The Wood Green ricin plot was a 2002 alleged bioterrorism plot to attack the London Underground with ricin poison. The Metropolitan Police Service arrested six suspects on 5 January 2003, with one more arrested two days later.
Within two days, the Biological Weapon Identification Group at the Defence Science and Technology Laboratory in Porton Down were sure that there was no trace of ricin on any of the articles that were found. This fact was initially misreported to other government departments as well as to the public, who only became aware of this in 2005. Reporting restrictions were in place before the public's perceptions could be corrected.
The only subsequent conviction was of Kamel Bourgass, sentenced to 17 years imprisonment for conspiring "together with other persons unknown to commit public nuisance by the use of poisons and/or explosives to cause disruption, fear or injury" on the basis of five pages of his hand-written notes on how to make ricin, cyanide and botulinum. Bourgass had already been sentenced to life imprisonment for the murder of detective Stephen Oake, whom he stabbed to death during his arrest in Manchester. Bourgass also stabbed three other police officers in that incident; they all survived. All other suspects were either released without charge, acquitted, or had their trials abandoned.
Physicians throughout the United Kingdom were warned to watch for signs that patients had been poisoned by ricin, and the public health director for London urged the public not to be alarmed following some media reports. Britain's largest circulation tabloid newspaper, The Sun, reported the discovery of a "factory of death", and other newspapers warned on their front pages "250,000 of us could have died", "Poison gang on the loose" and "Killer with no antidote".
The fact that no ricin had been found was known to some government departments very early on, but this information was not revealed to the public until after Bourgass's trial two years later, although in the interim it was cited as evidence for further terrorism laws, as well as featuring in US Secretary of State Colin Powell's 5 February 2003 speech to the UN to build the case for the 2003 invasion of Iraq, as part of the alleged Abu Musab al-Zarqawi global terrorist network. As late as February 2006, Chancellor Gordon Brown described it as a significant terrorism plot spanning 26 countries.