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Japan's quake-hit N-plant leaking radiation
There are fears of a disastrous meltdown at the plant, which was damaged by Friday's earthquake.
Fkushima: Radiation leaked from an unstable Japanese nuclear reactor north of Tokyo on Saturday, the government said, after an explosion blew the roof off the facility in the wake of a massive earthquake.
The developments raised fears of a disastrous meltdown at the plant, which was damaged by Friday's 8.9-magnitude earthquake, the strongest ever recorded in Japan.
"We are looking into the cause and the situation and we'll make that public when we have further information," Chief Cabinet Secretary Yukio Edano said.
Edano said an evacuation radius of 10 km (6 miles) from the stricken 40-year-old Daiichi 1 reactor plant in Fukushima prefecture was adequate. TV footage showed vapour rising from the plant, 240 km (150 miles) north of Tokyo.
The quake sent a 10-metre (33-foot) tsunami ripping through towns and cities across the northeast coast. Japanese media estimate that at least 1,300 people were killed.
The blast came as plant operator Tokyo Electric Power Co (TEPCO) worked desperately to reduce pressures in the core of the reactor.
"An unchecked rise in temperature could cause the core to essentially turn into a molten mass that could burn through the reactor vessel," risk information service Stratfor said in a report before the explosion.
"This may lead to a release of an unchecked amount of radiation into the containment building that surrounds the reactor," it said.
NHK television and Jiji said the outer structure of the building that houses the reactor appeared to have blown off, which could suggest the containment building had already been breached.
Earlier the operator released what it said was a tiny amount of radioactive steam to reduce the pressure and the danger was minimal because tens of thousands of people had already been evacuated from the vicinity.
Reuters journalists were in Fukushima prefecture, about 70 km (40 miles) from the plant. Other media have reported police roadblocks in the area to prevent people getting closer.
Italy's National Institute of Geophysics and Volcanology said the earth's axis shifted 25 cm as a result of the quake and the US Geological Survey said the main island of Japan had shifted 2.4 metres.
Friday's tremor was so huge that thousands fled their homes from coastlines around the Pacific Rim, as far away as North and South America, fearful of a tsunami.
Most appeared to have been spared anything more serious than some high waves, unlike Japan's northeast coastline which was hammered by the huge tsunami that turned houses and ships into floating debris as it surged into cities and villages, sweeping aside everything in its path.
"I thought I was going to die," said Wataru Fujimura, a 38-year-old sales representative in Koriyama, Fukushima, north of Tokyo and close to the area worst hit by the quake.
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