TOKYO (AP) - A powerful 7.5-magnitude earthquake struck off northern Japan late Monday, injuring more than 20 people and triggering a tsunami of up to 70 centimeters (28 inches) in Pacific coast communities, officials said. The Japan Meteorological Agency is warning of possible aftershocks and increased risk of a megaquake.

The Japanese government was still assessing damages from the tsunami and late-evening quake, which struck at about 11:15 p.m. (1415 GMT) in the Pacific Ocean around 80 kilometers (50 miles) off the coast of Aomori, the northernmost prefecture of Japan’s main Honshu island.

“I’ve never experienced such a big shaking,” convenience store owner Nobuo Yamada told the public broadcaster NHK in the Aomori prefecture town of Hachinohe, adding that “luckily” power lines were s

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