The lead Japanese public interest nuclear watchdog, Citizens Nuclear Information Center, held a translated international press conference in Tokyo on March 12, 2011 regarding now seven nuclear power plants in crisis as a result of the earthquake and tsunami. Explosive hydrogen gas and oxygen are being generated in two reactors with partial reactor core meltdowns. One explosion has already occurred in Fukushima Dai-ichi Unit 1 and another explosion is imminent at Fukushima Dai-ichi Unit 3, a reactor using plutonium oxide, or Mixed Oxide Fuel.