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TOKYO, March 11 (Reuters) - Japanese utility Hokuriku Electric Co said on Friday all of three reactors at its Onagawa nuclear plant on the northeast coast of Japan shut down automatically after a powerful earthquake.
Its Higashidori plant further north of Onagawa was in planned maintenance and was not affected by the quake, a company spokesman said, adding the company was checking facilities to see if there were fires or any other problems.
An earthquake measuring 8.4 struck off the northeast coast of Japan on Friday, shaking buildings in the capital Tokyo, causing "many injuries", triggering a 10-metre (30-ft) tsunami warning for the Pacific coast of Japan, NHK television and witnesses reported.
Tokyo Electric Power Co (TEPCO) said its two nuclear plants on the northeast coast of Fukushima Prefecture, north of Tokyo, shut down automatically.
The Tokai Daini nuclear plant of Japan Atomic Power Co, in which TEPCO has a major stake, located on the northeast coast and the closest to Tokyo, was shut automatically after the quake.
But TEPCO's Kashiwazaki-Kariwa nuclear plant, located on the opposite side of the coast in northern Japan, continued operations after the quake, a TEPCO spokesman said.
There were no reports of fire or any other incident so far from these nuclear plants, the TEPCO spokesman said.
Reporting by Risa Maeda and Osamu Tsukimori; Editing by Edwina Gibbs