Indonesia's volcano Semeru erupts, alert raised to highest level(1/5)

Mount Semeru releases volcanic materials during an eruption in Lumajang, East java, Indonesia. Dec. 4, 2022. (Photo/Agencies)

Indonesia's highest volcano on the country's most densely populated island of Java erupted Sunday. Authorities raised the volcano alert to its highest level.

Volcanic ash is seen from Pronojiwo following the eruption of Mount Semeru volcano, in Lumajang, East Java province, Indonesia, Dec. 4, 2022. (Photo/Agencies)

Mount Semeru volcano erupts volcanic ash as seen from Lumajang, East Java province, Indonesia, Dec. 4, 2022. (Photo/Agencies)

Pyroclastic flow rolls down the slope of Mount Semeru during an eruption in Lumajang, East java, Indonesia, Dec. 4, 2022. (Photo/Agencies)

Volcanic ash is seen from Pronojiwo following the eruption of Mount Semeru volcano, in Lumajang, East Java province, Indonesia, Dec. 4, 2022. (Photo/Agencies)