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This picture taken on August 21, 2010 shows a MOX fuel storage pool inside the Fukushima No.1 plant third reactor building. Scientists are concerned that the plutonium-uranium mixed fuel may be hard to control.

The nuclear crisis in Japan has intensified, as authorities announced a possible rupture at a second reactor unit at the tsunami hit Fukushima Daiichi plant. Scientists have warned of another complication following Friday's earthquake; the reactors hold a mixed-oxide fuel which contains plutonium. Arjun Makhijani, President of the Institute for Energy and Environmental Research joins us to explain why this combination could be a deadly concoction.