its existing stocks of 3.5 percent enriched uranium. Two days later during the celebrations in Tehran for the 31st anniversary of the 1979 revolution, President Mahmoud Ahmadinejad announced that Iran was now a "nuclear state." IAEA officials confirmed it has enriched uranium "up to 19.8%". Responding to criticism, Ahmadinejad said, "Why do they think that 20 per cent is such a big deal? Right now in Natanz we have the capability to enrich at over 20 per cent and at over 80 per cent, but because we don't need it, we won't do it." He added "If we wanted to manufacture a bomb, we would announce it." On the same day as Ahmadinejad's announcement, Ali Akbar Salehi, head of the Atomic Energy Organization of Iran, told Reuters that their 20 percent enrichment production, was going "very well," adding "There is no limit on enrichment. We can enrich up to 100% ... But we never had the intention and we do not have the intention to do so, unless we need (to)." He maintained that the 20 percent production was for a Tehran medical reactor, and as such would be limited to around 1.5 kg per month. Iran has reportedly breached its nuclear pact with world powers by surging its enriched uranium stock and further refining its purity beyond allowed standards, the UN atomic agency, International Atomic Energy Agency (IAEA) said. Diplomats closely monitoring the work of International Atomic Energy Agency's (IAEA) in Iran have said that investigators found traces of uranium at a secret atomic facility based in Tehran. Tehran Nuclear Declaration, 2010 US President Obama reportedly sent a letter dated 20 April 2010 to President Lula of Brazil, in which he outlined a proposed fuel swap. While expressing skepticism that the Iranians would now be willing to accept such a deal, having provided "no credible explanation" for the previous deal's rejection, President Obama wrote "For us, Iran’s agreement to transfer 1,200 kg of Iran’s low enriched uranium (LEU) out of the country would build confidence and reduce regional tensions by substantially reducing Iran’s LEU stockpile." Turkish Prime Minister Recep Tayyip Erdogan received a similar letter. A senior US official told The Washington Post that the letter was a response to Iran's desire to ship out its uranium piecemeal, rather than in a single batch, and that during "multiple conversations" US officials made clear that Iran should also cease 20