Mount Ruang, the southernmost stratovolcano in the Sangihe Islands arc, North Sulawesi, Indonesia had at least five large eruptions on 17 April, causing the Center for Volcanology and Geological Disaster Mitigation to issue its highest-level alert, indicating an active eruption.
Indonesian authorities issued a tsunami alert after the eruptions, the worry was that part of the volcano could collapse into the sea and cause a tsunami amid fears of a repeat of the 1871 disaster.
There were no reports of deaths or injuries but residents from nearby areas, including the remote island of Tagulandang, home to around 20,000 were advised to evacuate and a local provinicial airport was forced to close.
In 2018 the eruption of Indonesia's Anak Krakatau volcano caused a tsunami along the coasts of Sumatra and Java after parts of the mountain fell into the ocean, killing 430 people.
Related Resources:
Sentinel Asia activation for Mount Ruang eruption