The death toll from a volcano-triggered tsunami in Indonesia has risen to 281, with more than 1,000 people injured, the national disaster agency said Monday, as the desperate search for survivors ramped up.
"The number of victims and damage will continue to rise," said agency spokesman Sutopo Purwo Nugroho.
Hundreds of buildings were destroyed by the wave, which hit the coast of southern Sumatra and the western tip of Java about 9:30 pm (1430 GMT) on Saturday after a volcano known as the "child" of Krakatoa erupted, national disaster agency spokesman Sutopo Purwo Nugroho said.
Dramatic video posted on social media showed a wall of water suddenly crashing into a concert by pop group "Seventeen" -- hurling band members off the stage and then flooding into the audience.
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In a tearful Instagram post, frontman Riefian Fajarsyah said the band's bassist and road manager had been killed and his wife was missing.
Search and rescue teams were scouring rubble for survivors, with 222 people confirmed dead, 843 people injured and 28 missing, Nugroho said.
Tsunamis triggered by volcanic eruptions are relatively rare, caused by the sudden displacement of water or "slope failure," according to the International Tsunami Information Centre.
Unlike those caused by earthquakes, which trigger alert systems, these tsunamis give authorities very little time to warn residents of the impending threat.
The destructive wave left a trail of uprooted trees and debris strewn across beaches. A tangled mess of corrugated steel roofing, timber and rubble was dragged inland at Carita beach, a popular spot for day-trippers on the west coast of Java.
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Photographer Oystein Andersen described how he was caught up in the disaster while on the beach taking photos of Anak Krakatoa.
"I had to run, as the wave passed the beach and landed 15-20m inland," he wrote on his Facebook page.
"(The) next wave entered the hotel area where I was staying and downed cars on the road behind it."
The International Federation of Red Cross and Red Crescent Societies said the "powerful waves" reached a height of 30-90 centimetres (1-3 feet).
Asep Perangkat said he was with his family when the wave surged through Carita, carving a swath of destruction, dragging cars and shipping containers.
"Buildings on the edge of the beach were destroyed. Trees and electric poles fell to the ground," he told AFP.
In Lampung province, on the other side of the strait, Lutfi Al Rasyid fled the beach in Kalianda city, fearing for his life.
"I could not start my motorbike so I left it and I ran... I just prayed and ran as far as I could," the 23-year-old told AFP.
Kathy Mueller from the International Federation of Red Cross and Red Crescent Societies said the toll was likely to rise as the conditions on the ground became clearer.
"The situation, and the death toll, will remain fluid over the next days and even weeks," she told AFP.
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Aid workers were helping to evacuate the injured and bring in clean water and tarpaulins to provide shelter, she added, saying the group was preparing for the possibility of diseases breaking out in the tsunami zone.
US President Donald Trump was among world leaders to offer messages of support after the "unthinkable devastation" of Saturday's tsunami.
"We are praying for recovery and healing," he tweeted. "America is with you!" The UN and European Union both pledged to mobilise humanitarian support if requested by Jakarta.
"The United Nations stands ready to support the ongoing government-led rescue and relief efforts," a spokesman for UN Secretary-General Antonio Guterres said in a statement.
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Anak Krakatoa, which forms a small island in the Sunda Strait between Java and Sumatra, emerged around 1928 in the crater left by Krakatoa, whose massive eruption in 1883 killed at least 36,000 people and affected global weather patterns for years.
"The cause of the undersea landslide was due to volcanic activity of Anak Krakatoa, which coincided with a high tide due to the full moon," Nugroho told reporters in Yogyakarta.
Professor David Rothery from The Open University said that the proximity of the volcano to the coast gave authorities very little time to act.
"This is so close to the affected shorelines that warning time would have been minimal given the high speeds at which tsunami waves travel," he said.
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Indonesian authorities initially said the wave was not a tsunami, but instead a tidal surge and urged the public not to panic.
Nugroho later apologised, saying because there was no earthquake it had been difficult to ascertain the cause of the incident early on.
"If there is an initial error we're sorry," he wrote on Twitter.
Large numbers of casualties were recorded at two hotels in Pandeglang district, Nugroho said, without elaborating.
Eleven people died further north in Serang, while 48 were killed in South Lampung, on Sumatra island.
Heavy equipment was being transported to badly hit areas to help search for victims, and evacuation posts and public kitchens were being set up for evacuees, Nugroho added.
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According to Indonesia's geological agency, Anak Krakatoa had been showing signs of heightened activity for days, spewing plumes of ash thousands of metres into the air.
Indonesia is one of the most disaster-prone nations on Earth due to its position straddling the so-called Pacific Ring of Fire, where tectonic plates collide.
(With IANS and AFP inputs)
