A volcanic island in Indonesia's Sunda Strait has erupted 49 times prompting authorities to expand the danger zone from one kilometre to two, an official said.
Mount Anak Krakatau has emitted ash, sand and red-hot rocks since midnight on Thursday, said Sutopo Nugroho from the National Disaster Management Agency.
"Despite the eruptions, flights and sea navigation remain safe," he said.
Anak Krakatau, or the Child of Krakatau, emerged from the caldera formed in 1883 after the legendary eruption of Mount Krakatau.
The 1883 eruption, one of the most deadly volcanic events in modern history, generated tsunamis and killed about 36,000 people.
