Emergency officials in Hawaii are warning residents near Mauna Loa of Pele’s Hair — but what is it and why is it dangerous?

Mauna Loa, the world’s largest active volcano, began erupting at about 11:30 p.m. Sunday, Nov. 27, McClatchy News reported.

The eruption is confined to Moku‘āweoweo, the summit caldera of the 13,100-foot volcano, the Hawaii Volcano Observatory reported.

Lava has overflowed the caldera but does not pose a threat to populated areas at the moment, emergency officials said Monday, Nov. 28.

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Read more: yahoo