The Indonesian government immediately raised the alert level of Semeru volcano in the east of Java Island to the highest level after it erupted on the 4th. The Indonesian National Disaster Relief Administration said in a statement that the Semeru volcano erupted at 2:46 a.m. on the 4th. Some videos posted on social media show that the volcano spewed ash into the sky, covering several villages around. Indonesian government departments announced on the 4th that the alert level of Semeru volcano was raised from level 3 to the highest level of the country's level 4 volcano alert level. Local media reported that the surrounding areas of the volcano had begun to evacuate people, based on several local officials. Local volunteer Bayou Deni Afiento told reporters by phone: "Since this morning, most of the roads (around the volcano) have been closed. The volcanic ash falls like rain, blocking the view of the volcano." Until later that day, the volcano was still erupting, but he felt that "the degree is not too severe". The Indonesian government warned people not to enter the area 8 kilometers around the crater, and not to carry out any activities within 13 kilometers of the direction of volcanic ash. As of late that day, no casualties were reported. The Japan Meteorological Agency warned earlier on the 4th that the eruption of the Semeru volcano may cause a tsunami to Japan, but the tsunami warning was lifted a few hours later. With an altitude of 3676 meters, Semeru Volcano is the highest volcano in Java Island and a famous mountain climbing scenic spot. It is also one of the most active volcanoes in Indonesia. It has erupted many times in recent years. Semeru volcano also started a violent eruption on December 4 last year, which lasted for many days, causing dozens of deaths. Indonesia is located in the Pacific Rim volcanic belt, with frequent earthquakes and volcanic activities. There are about 130 active volcanoes in the country.