A powerful aftershock rocked Japan's tsunami disaster zone, killing at least three and triggering new concerns over nuclear power plants in a region still grappling with an atomic emergency.
Electricity was cut across a huge area of northern Japan, forcing cooling systems at three nuclear plants to switch to emergency power and plunging more than 3.3 million households into darkness late Thursday night.
At least one back-up supply remained online at all three plants, but the aftershock highlighted the potential risks of nuclear generation in an earthquake zone amid a battle to stabilise reactors at tsunami-hit Fukushima.
National broadcaster NHK said a total of three people had been killed by the 7.1 magnitude tremor -- one of the most powerful to hit Japan since the country's worst post-war disaster nearly four weeks ago.
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