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Manado, Indonesia — Indonesia’s Mount Ruang volcano spewed more hot clouds on Wednesday after an eruption the previous day forced the closure of schools and airports, pelted villages with volcanic debris and prompted hundreds of people to flee. Seven airports, including Sam Ratulangi international airport in Manado, the capital of North Sulawesi province, remained closed after Tuesday’s eruption, the second in two weeks. Schools were shut to protect children from volcanic ash.

The volcano is on tiny Ruang Island, part of the Sitaro islands chain.

The Indonesian geological agency urged people to stay at least 4 miles from the volcano’s crater. It warned people on nearby Tagulandang Island, the closest to the volcano, of possible super-heated volcanic clouds from a further eruption and a tsunami if the mountain’s volcanic dome collapses into the sea.

Tuesday’s eruption darkened the sky and peppered several villages with ash, grit and rocks. No casualties were reported. The country’s disaster management agency posted dramatic video online of dozens of lightning strikes flashing in the cloud of hot gases and debris belching from the volcano’s crater overnight.

Video released by the National Search and Rescue Agency showed about a hundred villagers from Tagulandang Island being evacuated on a navy ship. Hundreds of others were waiting at a local port to be evacuated.

Agency spokesperson Abdul Muhari said 11,000 to 12,000 people living within the 4-mile danger zone would be taken to government shelters.

After Mount Ruang’s April 17 eruption, authorities warned that a subsequent eruption might collapse part of the volcano into the sea.

Ruang is among about 130 active volcanoes in Indonesia. The archipelagic nation is prone to volcanic eruptions and earthquakes because of its location on the Pacific “Ring of Fire,” a series of fault lines stretching from the western coast of the Americas through Japan and Southeast Asia.