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FILE – This April 1986 aerial file photo shows the Chernobyl nuclear power plant, the site of the world’s worst nuclear accident, as made two to three days after the explosion in Chernobyl, Ukraine. Japan raised the crisis level at its crippled nuclear plant Tuesday April 12, 2011, to a severity on par with the 1986 Chernobyl disaster, citing high overall radiation leaks that have contaminated the air, tap water, vegetables and seawater. Japanese nuclear regulators said they raised the rating from 5 to 7 _ the highest level on an international scale of nuclear accidents overseen by the International Atomic Energy Agency _ after new assessments of radiation leaks from the Fukushima Dai-ichi plant since it was disabled by the March 11 tsunami. (AP Photo/File)