The alert level of the volcano remains at the second highest level, he added.
A spokesman for Indonesia's National Disaster Management Agency said the ash cloud was not affecting Denpasar's flight paths and stated that it was still safe to fly in and out of the airport. More eruptions followed and continued into Sunday, with a "medium-pressure eruption" in the early evening that sent ash 2,000 meters into the air, the agency said.
Mount Agung volcano erupts in Karangasem, Bali island, Indonesia, Sunday, Nov. 26, 2017.
Authorities warned anyone still in the exclusion zone around the volcano, which extends 7.5 kilometres (4.5 miles) from the crater in places, to leave. The twelve departures affected include from Bali to Sydney, Adelaide and Melbourne by Jetstar, to Brisbane by Virgin Airlines, and two to Sydney and one to Amsterdam by KLM.
The island's main airport is for now operating normally, but some airlines have cancelled flights.
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Bali is a popular tourist destination, known for its seaside resorts and sandy beaches.
The volcano in eastern Bali erupted three times Saturday, and is expected to continue doing so.
Under these circumstances, Garuda Indonesia enforces exemption policy for cancellation fee, rebooking/reroute fee, refund fee, administration fee and other ticket change fees for passengers who have scheduled flights to and from Lombok.
Many of them have since returned home after the weakening of the activity of the volcano, but the smoke of the last days has resulted in the departure of 25 000 inhabitants, refugees in more than 200 shelters. An eruption in 1963 killed 1,549 people. Chances are that the eruption intensifies in the coming days, but just how much and how long it will last, and how unsafe it might become, is impossible to say at the moment.
Indonesia sits on the Pacific "Ring of Fire" where tectonic plates collide, causing frequent seismic and volcanic activity.