On 12 May 2006, claims that highly enriched uranium (well over the 3.5% enriched level) was reported to have been found "at a site where Iran has denied such sensitive atomic work", appeared. "They have found particles of highly enriched uranium but it is not clear if this is contamination from centrifuges that had been previously found [from imported material or something new," said one diplomat close to the UN International Atomic Energy Agency (IAEA). These reports have not yet been officially confirmed by the IAEA (as of 1 June 2006).