Indonesia on Thursday raised the danger alert level for an erupting volcano that sparked a killer tsunami at the weekend.
Photo: AFP A man walks amid debris from damaged buildings in Carita on December 23, 2018, after the area was hit by a tsunami on December 22 following an eruption of the Anak Krakatoa volcano
Authorities also widened a no-go zone around rumbling Anak Krakatoa to five kilometres - up from a previous two kilometres - and warned shell-shocked residents to stay away from the coast, after more than 400 were killed by Saturday night's killer wave.
Plumes of ash burst into the sky as pyroclastic flows - hot gas and other volcanic material - flowed down the crater, threatening anyone too close to the volcano and raising the risk of rough seas for boats in the vicinity.
"There is a danger of more eruptions," said national disaster agency spokesman Sutopo Purwo Nugroho.
"People (near the volcano) could be hit by hot rocks, pyroclastic flows and thick ash."
Authorities raised the crater's status to high alert, the second-highest warning on the country's four-point danger scale, while aviation officials ordered flights to be redirected away from the area.
"We've raised the status of (the volcano) since this morning because there's been a change in the eruption pattern," said Kus Hendratno, a senior official at the Krakatoa observatory.
The new flows posed no immediate danger to area towns as the volcano sits in the middle of the Sunda Strait between Java and Sumatra islands.
However, the status change sparked new fears with many residents already scared and refusing to return to their communities over fears of another tsunami.
A section of the crater - which emerged at the site of the Krakatoa volcano, whose massive 1883 eruption killed at least 36,000 people - collapsed after an eruption and slid into the ocean, triggering Saturday night's killer wave.
At least 430 people were killed, with 1,495 people injured and another 159 were missing.
Nearly 22,000 people have been evacuated and are living in shelters.
