The Indonesian volcano Sinabung on the island of Sumatra spewed a gigantic ash cloud 5 kilometres into the air on Monday.
It was the volcano’s second eruption in three days with a thunderous sound, and dark skies, authorities and witnesses said.
The volcano’s eruption came after more than a year of inactivity and was the second since Saturday when authorities warned residents and tourists about possible lava flows.
Dramatic images of the morning eruption, captured by residents, showed a giant cloud of thick ash rising from the top of the 2,460-meter mountain in Karo, North Sumatra.
Residents have been advised to stay outside a 2-mile radius around the volcano and wear masks against falling volcanic ash, the volcanology office said in a statement.
No casualties have been reported, and a civil aviation authority spokeswoman said flights were still operating in the region.