Carita, Dec 27 : Indonesia on Thursday raised the danger alert level for an erupting volcano that sparked a killer tsunami at the weekend, after previously warning that fresh activity at the crater threatened to trigger another deadly wave.

Authorities also widened a no-go zone around rumbling Anak Krakatoa to five kilometres (three miles) -- 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," Kus Hendratno, a senior official at the Krakatoa observatory, told AFP Thursday.

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.

But the status change sparked new fears with many residents already scared and refusing to return to their communities over fears of another tsunami.

"This worries me," said Ugi Sugiarti, a cook at the Augusta Hotel in hard-hit Carita.

"I've already left." Sukma, a security guard at the shattered Mutiara Carita Cottages, added: "Just please pray for us and that everything will be okay." 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.

On Wednesday evening, the disaster agency said that wind was blowing "ash and sand" from the volcano to the nearby towns of Cilegon and Serang on Java, and advised residents to wear masks and glasses if they had to venture outdoors.

Torrential rains have sparked flooding in some areas, hampering the relief effort and heaping more misery on the stricken region, as thousands cram emergency shelters.

Medical workers have warned that clean water and medicine supplies were running low -- stoking fears of a public health crisis.

Indonesia, a vast Southeast Asian archipelago, is one of the most disaster-hit nations on Earth due to its position straddling the so-called Pacific Ring of Fire, where tectonic plates collide.

The tsunami was Indonesia's third major natural disaster in six months, following a series of powerful earthquakes on the island of Lombok in July and August and a quake-tsunami in September that killed around 2,200 people in Palu on Sulawesi island, with thousands more missing and presumed dead.

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New Delhi (PTI): Congress leader Shashi Tharoor on Thursday expressed confidence in the victory of the United Democratic Front (UDF) in Kerala, saying the Congress-led alliance will win more than 75 seats out of the total 140 in the state.

Tharoor, who hails from Kerala, said he was not surprised to see the results of the exit polls, most of which predicted a victory for the UDF that has been out of power for 10 years in the state.

"We have been on the ground. I have campaigned in 59 constituencies across 12 districts out of 14. I was very confident we are going to win.

"Everything that I have picked up from not just my party colleagues and workers but also from other observers, media and others have always convinced me that we were going to score a comfortable win of above 75 seats. And all the (exit) polls have confirmed the same thing," he told reporters here.

The Thiruvananthapuram MP said he was not surprised to see the results of the exit polls but in general he was not a big fan of exit polls in India.

"Because ours is not purely a homogenous society. We have to take into account gender issue, caste issue, class issue, regional disparities. You never get a convincingly large enough sample to give an accurate poll and now there is the additional complication that we have heard about in West Bengal this year that many people are unwilling to answer the questions of the pollsters," he said.

The Congress leader said normally, it used to be below 10 per cent that people said that they would not answer.

"Even if you are a reputable exit pollster, in Bengal, one polling company has said 60 per cent of people refused to answer. So, what is the worth of a poll where 60 per cent of your respondents have not answered," he said.

Several exit polls on Wednesday predicted a comeback by the Congress-led UDF in Kerala after 10 years, dethroning the CPI(M)-led Left Democratic Front (LDF).

Polling for the 140-member Kerala assembly was held on April 9. Results of assembly elections in West Bengal, Tamil Nadu, Assam, Puducherry, besides Kerala, will be announced on May 4.