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Balinese children play soccer as the Mount Agung volcano spews volcanic ash in Karangasem, Bali, Indonesia on Nov. 26, 2017.

Authorities in Indonesia ordered people within six miles of a volcano in eastern Bali to evacuate as eruptions sent plumes of volcanic ash skyward.

Mount Agung’s volcanic activity had already canceled dozens of airline flights; government authorities earlier said people closer than 4.6 miles from the volcano should evacuate.

The disaster board said it raised the alert level at 6 a.m. Monday local time because the volcano had shifted from steam eruptions to “magmatic” ones.

Observers were not immediately expecting a major volcanic event, but Gede Suantika of the National Disaster Mitigation Agency said they need to be "cautious over the possibility of a strong, explosive eruption.”

The agency said Bali’s international airport closed for 24 hours, but that authorities would consider reopening it Tuesday, The Associated Press reported.

Early Monday, Indonesia also upgraded its Volcano Observatory Notice for Aviation (VONA) to red, its highest warning, The Telegraph reported. Authorities said top of the volcano’s ash cloud could reach 19,654 feet or higher.

When Mount Agung last erupted in 1963, it killed more than 1,000 people and destroyed several villages, AP reported.

Follow Greg Toppo on Twitter: @gtoppo

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Villagers sit on a truck during an evacuation following the eruption of Mount Agung, seen in the background, in Karangasem, Indonesia on Nov. 26, 2017.