Red alert issued as ash from Mount Agung rises 4,000 meters (about 2.5 miles) into the sky.
This is according to Sutopo Purwo Nugroho, head of information and data for Indonesia’s National Disaster Management Agency.
The red warning means an eruption is forecast to be imminent, with significant emission of ash likely.
Most reports say 25,000 have been evacuated, but one report estimates as many as 140,000 evacuees.
Authorities have begun distributing masks in some areas as ash falls.
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