Indonesia's Anak Krakatoa volcano erupted on Friday, belching a column of ash more than three kilometres into the sky, officials said.
The volcanic island emerged from the sea at the beginning of the last century from the crater formed after the 1883 eruption of Mount Krakatoa -- one of the deadliest and most destructive in history.
Anak Krakatoa, which means "Child of Krakatoa", spewed thick ash over the strait that separates the islands of Java and Sumatra.
There were no immediate reports of damage or casualties after the eruption at 08:46 am (0146 GMT).
"The height of the eruption column was observed to be 3,000 metres (nearly 10,000 feet) above the summit," Deny Mardiono, an official from the Krakatoa monitoring station, said in a press release.
"The ash column was observed to be grey to black with thick intensity to the southwest."
He warned the public not to carry out activities within a five-kilometre (three-mile) radius of the volcano's crater.
Anak Krakatoa's status was at the second-highest warning level after authorities raised it in 2022 following a sharp rise in volcanic activity.
Its crater partly collapsed in 2018 when a major eruption sent huge chunks sliding into the ocean, triggering a tsunami that killed more than 400 people and injured thousands.
Indonesia, a Southeast Asian archipelago nation, sits on the Pacific Ring of Fire, where the meeting of continental plates causes high volcanic and seismic activity.
"This is part of an eruption phase associated with the formation of a new body for the volcano," Oktory Prambada, an official at the Center of Volcanology and Geological Hazard Mitigation, told AFP.
In 2018, its crater partly collapsed when a major eruption sent huge chunks of the volcano sliding into the ocean, triggering a tsunami that killed more than 400 people and injured thousands.
There were no immediate reports of injuries or damage.
Prambada said the volcano's alert status remained at the second-highest level after the series of eruptions, with authorities imposing an exclusion zone of five kilometers (3.1 miles) around the crater.
Anak Krakatoa, which sits in a strait that separates the islands of Java and Sumatra, has been sporadically active since it emerged from the sea at the beginning of last century in the caldera formed after the 1883 eruption of Mount Krakatoa.
That disaster was one of the deadliest and most destructive in history with an estimated 35,000 people killed.
Indonesia, a Southeast Asian archipelago nation, sits on the Pacific Ring of Fire, where the meeting of continental plates causes high volcanic and seismic activity.
The country has nearly 130 active volcanoes.
