HONG KONG — Officials in Indonesia say 100,000 people on the island of Bali need to be evacuated from a danger zone around the Mount Agung volcano, which has begun erupting and sending dark clouds of ash into the air.

The ash forced the closing of the Ngurah Rai Airport in Denpasar, Bali’s capital. It was scheduled to reopen Tuesday, but that decision could be postponed based on conditions, officials said.

Volcanic activity is now at a very high level, and the probability of a bigger eruption is increasing, Indonesia’s Center for Volcanology and Geological Hazard Mitigation said. Just how big can’t be determined, in part because there is so little information about what sort of activity came before the last deadly eruption in 1963.

The agency warned of potential hazards including pyroclastic flows — a mix of hot gases, lava fragments and ash — that the volcano could project up to six miles in a few minutes. And heavy ash could fall, blanketing areas up to five feet deep even miles from Mount Agung.


A motorbike driver tried to avoid volcanic ash in Karangasem, Bali, on Monday.

Made Nagi/European Pressphoto Agency

Sutopo Purwo Nugroho, a spokesman for Indonesia’s national disaster agency, also warned of the dangers of lahars, volcanic mudflows made up of water, rocks and pyroclastic materials.

Indonesia raised its alert for Mount Agung to the highest level on Monday, and the exclusion zone around the volcano was extended to six miles.

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