Indonesia's Mount Sinabung spewed a giant ash cloud 5 km (3.1 miles) into the sky on Monday (August 10) in its second eruption in three days, emitting a thunderous noise and turning the sky dark, authorities and witnesses said.

Indonesia's Mount Sinabung erupts, turns day into night

Mount Sinabung on Sumatra island, which has been rumbling since 2010 and saw a deadly eruption in 2016, spewed the thick plume after activity picked up recent days

Indonesia's Mount Sinabung spews massive smoke-and-ash column

Western Indonesian regions and Sumatra island have been put on high alert.?

Indonesia's Mount Sinabung erupts, no casualties reported?

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Indonesia's Mount Sinabung erupts, turns day into night

Indonesia's Mount Sinabung spews massive smoke-and-ash column

Indonesia's Mount Sinabung erupts, no casualties reported?