Stuxnet was a joint US-Israeli cyber-weapon — developed under the codename Operation Olympic Games — designed to sabotage Iran's uranium enrichment programme at the Natanz facility by targeting Siemens S7-315 and S7-417 programmable logic controllers (PLCs) governing IR-1 centrifuges. Discovered in the wild in June 2010 by Belarusian security firm VirusBlokAda and subsequently analysed in detail by Symantec and German researcher Ralph Langner, Stuxnet exploited four zero-day vulnerabilities. The New York Times' David Sanger confirmed the US-Israeli authorship in a 2012 report based on US official sources. Approximately 1,000 IR-1 centrifuges are estimated to have been physically destroyed by the worm. It is the first publicly known nation-state cyber-weapon designed to cause physical-world destruction.