Mount Sinabung in 2015
Mount Sinabung, one of about 130 active volcanoes in Indonesia, has been at the highest alert level for nearly two weeks. On Tuesday, at least 48 avalanches of hot ash barreled down its slopes, with the biggest reaching 2.5 kilometers (1.5 miles) southeastward. The volcano in northern Sumatra, one of Indonesia's main islands, has also been shooting smoke and ash more than 700 meters (2,300 feet) into the air.
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