Mount Semeru, which lies around 640 kilometers (400 miles) southeast of the capital Jakarta, began erupting at 2:46 a.m. local time Sunday (2:46 p.m. Pyroclastic flow rolls down the slope of Mount Semeru during an eruption in Lumajang, East Java. Standing at 3,676 meters (12,060 feet), Mount Semeru is the tallest volcano on Java – and one of its most active ones. People take shelter at a community hall in Candipuro village following Mount Semeru's volcanic eruption in Lumajang, East Java on December 4, 2022. Rescue workers monitor the flow of volcanic materials from the eruption of Mount Semeru, in Lumajang, East Java, Indonesia, on December 4, 2022.

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