Iran raises Middle East tensions Iran has resumed enriching uranium to 20 percent purity and seized a South Korean-flagged oil tanker in the strategic Strait of Hormuz, moves likely to further escalate tensions with the United States Jan 4, Fordow Iran begins process of enriching uranium up to 20 percent purity at underground nuclear facility Jan 4, Bandar Abbas Hankuk Chemi tanker and crew detained after Iranian forces seize ship in busy Strait of Hormuz oil transit route TURKEY IRAQ KUWAIT SAUDI ARABIA Caspian Sea Tehran Natanz enrichment facility Bushehr nuclear power plant The Gulf TURKMENISTAN IRAN Strait of Hormuz AFGHANISTAN PAKISTAN 200km 125 miles EFFORT NEEDED TO ENRICH URANIUM: Uranium can be used for nuclear fuel and weapons by boosting concentration of uranium-235 (U-235) atoms* 83.5% effort: Needed to reach 4% U-235 – approx level used for fuel in commercial nuclear power plants 8.5% more effort Needed to reach 20% U-235 – used for fuel in nuclear research reactors Only 8% more effort Needed to reach 90% U-235 – level required to produce nuclear weapons 2015 nuclear deal with world powers limits Iran to 3.67% U-235 *Natural uranium contains 0.7% U-235 Sources: BBC, CNN, Reuters © GRAPHIC NEWS