A powerful earthquake struck near Japan's crippled Fukushima nuclear plant today shaking buildings in Tokyo. No tsunami warning was issued and no damage immediately reported. The US Geological Survey said the quake had a magnitude of 6.0 and hit less than 11 kilometres below ground, 70 kilometres south of Fukushima city in the prefecture of the same name. Japanese officials had put the magnitude at 6.3. Emergency workers grappling to bring stricken reactors under control at the Fukushima Daiichi nuclear plant were ordered to evacuate, an official from operator Tokyo Electric Power said adding there is no report of any abnormality in the external power to the Fukushima Daiichi plant.