MEDAN: Indonesia's Mount Sinabung erupted on Monday (Aug 10), belching a massive column of ash and smoke 5,000m into the air and coating local communities in debris.
The volcano on Sumatra island has been rumbling since 2010 and saw a deadly eruption in 2016.
Activity had picked up in recent days, including a pair of smaller eruptions at the weekend.
There were no reports of injuries or deaths, but authorities warned of possible lava flows.
"People living nearby are advised to be on alert for the potential appearance of lava," Indonesia's Volcanology and Geological Hazard Mitigation Centre said in a statement.
The crater's alert status remained at the second-highest level.
A spokeswoman for the civil aviation authority said flights were still operating in the region.
"The situation around Mount Sinabung is very dark now," said Gilbert Sembiring, who was visiting a friend in Naman Teran Kampung when Sinabung erupted.
"It was bigger than the eruption a couple of days ago."
No one lives inside a previously announced no-go zone around the volcano, but small communities nearby were coated in a layer of thick ash from Monday's eruption.
"The sound was like thunder, it lasted for less than 30 seconds," resident Fachrur Rozi Pasi told Reuters by phone.
Sinabung roared back to life in 2010 for the first time in 400 years. AfteRead More – Source