The agency warned of falling volcanic rocks in areas within 3 kilometers (1.8 miles) of the crater and possible flow of lava, ash and searing gas within 2 kilometers (1.2 miles).
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Sakurajima, about 1,000 kilometers (600 miles) southwest of Tokyo, is one of the most active volcanos in Japan and has repeatedly erupted. It used to be an island but became a peninsula following an eruption in 1914.