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Tokyo: A powerful earthquake with a preliminary magnitude of 6.4 knocked over houses in southern Japan on Thursday evening, and police said people may be trapped underneath. There were no immediate reports of casualties from the 9:26 pm quake, and no risk of a tsunami. "There was a ka-boom and the whole house shook violently sideways," Takahiko Morita, a resident of Mashiki, the town at the epicenter, said in a telephone interview with Japanese broadcaster NHK. "Furniture and bookshelves fell down, books were all over the floor." Morita said some houses and walls collapsed in his neighborhood, and water supply was cut off.