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However, Iran's uranium enrichment levels may be cause for concern. According to the International Atomic Energy Agency (IAEA), Iran has accumulated than 400 kilograms (881 pounds) of uranium enriched to 60%. That level of enrichment far exceeds what is needed for civilian energy production — and is close to weapons-grade material. At 90% enrichment, those 400 kilograms would be weapons-grade — enough for approximately 10 nuclear warheads. "As confirmed by the IAEA, Iran accelerated its enrichment to 60%, plus [there has been] a rise in missile tests," security expert Hans Jakob Schindler from the Counter Extremism Project told DW. "You could say this was to further its negotiation position with the United States, but you could also look at it and say [Tehran] is running towards a [nuclear] bomb.”