Hawaii's Kilauea volcano erupted from its summit before dawn Thursday, shooting a dusty plume of ash about 9,000 metres into the sky.
The explosion came after two weeks of volcanic activity and the opening of more than a dozen fissures east of the crater that spewed lava into neighbourhoods, said Mike Poland, a geophysicist with the U.S. Geological Survey.
The lava has destroyed at least 26 homes and 10 other structures.
The crater is within Hawaii Volcanoes National Park, which has been closed since May 11 in preparation for an eruption.
Officials have said they didn't expect the explosion to be deadly as long as people remained out of the closed national park.
Kilauea is one of the world's most active volcanoes. An eruption in 1924 killed one person, and sent rocks, ash and dust into the air for 17 days.
Decades of eruptions
Scientists warned on May 9 that a drop in the lava lake at the summit might create conditions for an explosion that could fling ash and boulders the size of refrigerators into the air.
Scientists predicted it would mostly release trapped steam from flash-heated groundwater released as though it was a kitchen pressure cooker.
Communities two to three kilometres away may be showered by pea-size fragments or dusted with non-toxic ash, they said.
Kilauea volcano has been erupting continuously since 1983.
It's one of five volcanoes that comprise the Big Island of Hawaii, and the only one currently erupting.