The Conspiracy of Fire Nuclei (SPF) is a radical anarchist organization from Greece, founded in 2008. On 21 January 2008, it carried out a wave of eleven firebombings targeting luxury car dealerships and banks in Athens and Thessaloniki, and the group began to use crude time bombs in September 2009. In 2011, the United States declared the SPF to be a terrorist group for its attacks, and it sent a parcel bomb to German finance minister Wolfgang Schaeuble on 15 March 2017; a day later, a letter bomb was sent to the International Monetary Fund building in Paris, France, injuring an employee.