TOKYO (AP) - A strong earthquake with a preliminary 6.6 magnitude has struck off of Japan's eastern coast Saturday. That's according to Japan's meteorological agency. There are no immediate reports of injuries or damage.

The quake, which occurred off the coast of Fukushima prefecture about 150 miles northeast of Tokyo, was followed by a magnitude 5.4 aftershock. The quake shook buildings as far away as Tokyo.

The agency issued a tsunami warning for parts of Japan's eastern coast, but the Pacific Tsunami Warning Center in Honolulu said there was no broad threat in the Pacific. But the tsunami center says earthquakes of this magnitude can generate local tsunamis that can be destructive within a 60-mile range.

Japan sits atop four tectonic plates and is one of the world's most earthquake-prone countries.

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