"The International Atomic Energy Agency said in a confidential report circulated to member states that Iran had grown its stockpile of 60%-enriched uranium to 408.6 kilograms from 274.8 kilograms in early February, an increase of around 50%. The Wall Street Journal viewed a copy of the report."
For those reluctant to do the math, 15kg appears to be supercritical mass for a U-235 bomb. Usually 90% U-235 is minimum for a bomb. This would suggest 244 kg of U-235 with a lot more centrifuging or 16 Hiroshima-sized bombs. Unlike an implosion device, U-235 can be turned onto a bomb that requires no testing. We did not test Little Boy (a U-235 bomb) before using it on Nagasaki. There was no need. Our first sign of an Iranian successful product might well be a mushroom cloud over Jerusalem or Washington. DC. Either one would cause thermonuclear war.
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