The crater of Mount Ruang flamed with lava against a backdrop of lightning bolts overnight after erupting four times on Wednesday, forcing authorities to raise its alert level to the highest of a four-tiered system.
Stunning high-definition images released by Indonesia's Center for Volcanology and Geological Hazard Mitigation that day captured the lava and ash spewing from Mount Ruang, reflected on the water's surface and putting the volcano in sharp relief against the night sky.
This development comes after the volcano erupted five times in rapid succession, unleashing a torrent of volcanic ash and posing a significant threat to air travel safety.
Ruang Mountain, an island in Indonesia, has had at least five large eruptions in the last 24 hours.