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The explosion Tuesday at Japan's Fukushima Daiichi nuclear plant has elevated the situation there to a "serious accident" on a level just below Chernobyl, a French nuclear official said, referring to an international scale that rates the severity of such incidents.

The International Nuclear and Radiological Event Scale -- or INES -- goes from Level 1, which indicates very little danger to the general population, to Level 7, a "major accident" in which there's been a large release of radioactive material and there will be widespread health and environmental effects.

"It's clear we are at Level 6, that's to say we're at a level in between what happened at Three Mile Island and Chernobyl," Andre-Claude Lacoste, president of France's nuclear safety authority, told reporters Tuesday.

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