Amateur video and aerial footage show the tsunami-hit Mentawai islands
Relief efforts have been stepped up in Indonesia as three aid ships reached the worst-hit parts of the island chain devastated by Monday’s tsunami.
Rescue teams are now at work on North Pagai island in the remote Mentawai Islands off western Sumatra.
More than 340 people are known to have died. Hundreds are still missing.
Indonesia’s president has visited the islands, which were inundated after a 7.7-magnitude undersea earthquake triggered the tsunami three days ago.
President Susilo Bambang Yudhoyono cut short a trip to Vietnam to oversee the rescue effort, flying in a helicopter loaded with food and other basic necessities to the remote and inaccessible islands.
There he met both survivors and local officials, promising the central government would help West Sumatra’s government to build temporary homes, health facilities and schools, his spokesman said.
Local officials say most of the villages hit by the tsunami have been reached, with victims from the worst-hit areas being buried in mass graves.
But almost 400 remain unaccounted for, and rescuers are now working on the assumption that a large number of those missing will not be found alive.
“Those who survived have nothing left except for the clothes on their body”
Hendri Dori Satoko Mentawai legislative councilIn pictures: Indonesia tsunami relief
Although three aid ships carrying food, water, medical supplies and volunteers have now arrived in the disaster zone, bad weather and rough seas remain a major challenge to the relief effort, officials say.
Aerial images of the destruction taken from helicopters show some villages were simply washed away by Monday’s 3m (10ft) wave, while the scale of the damage in the worst-affected communities is slowly emerging.
On South Pagai, the hardest-hit island, two villages were completely destroyed, said Hendri Dori Satoko, chairman of the Mentawai legislative council. No houses, government buildings or medical facilities remained standing.
He said most people had been fast asleep when the tsunami struck.
“People who managed to escape went to the mountains,” he told the BBC. “Others are missing and presumed dead.
“Those who survived have nothing left except for the clothes on their body. They had to run and had no time to save their belongings.”
Some survivors have been evacuated to North Pagai by speed boat, and the Mentawai Islands district chief, Edison Saleleubaja, said work would continue through the night to evacuate the injured for treatment at health clinics.
The relief effort was limited, said Hartje Robert Winerungan, a spokesman for the National Disaster Management Agency, as helicopters and aid ships were taking hours to reach affected areas.
Many villages were simply washed away by the 3m (10ft) wave “Some villages in the remote island can’t be reached so far,” said Mr Winerungan. “We’re working on it.”
Search teams have found bodies strewn along beaches and roadsides as they scour the islands, reports say.
However, many are still looking for their loved ones, even as the fear grows that they will not find them alive.
Many islanders were sleeping as the wave struck. Indonesian officials said locals had been given no indication of the coming wave, as a high-tech tsunami warning system installed in the wake of 2004’s giant Indian Ocean tsunami was not working.
Two buoys monitoring rising water levels off the Mentawai islands had been vandalised and were out of service, officials told the BBC.
But even a functioning warning system may not have provided sufficient warning, as the epicentre of the earthquake was so close to the Mentawai chain of islands that those living there had barely five or 10 minutes after the quake to make their escape to higher ground.
The vast Indonesian archipelago sits on the Pacific Ring of Fire, one of the world’s most active areas for earthquakes and volcanoes.
More than 1,000 people were killed by an earthquake off Sumatra in September 2009.
In December 2004, a 9.1-magnitude quake off the coast of Aceh triggered a tsunami in the Indian Ocean that killed a quarter of a million people in 13 countries including Indonesia, Sri Lanka, India and Thailand.
Sikakap hospital
Hundreds of injured survivors crowd into makeshift hospital; several villages nearby completely flattened
Macaronis resort
Villas destroyed; only the main building is still standing, which owner Mark Loughran said “saved everybody from being swept away”
Muntei Baru Baru
Entire village flattened – including 70 houses, a school and a church; Dozens of victims buried in mass grave
Sabeugungung
Village completely destroyed, with 50 reported dead and 150 missing
Bosua
Some 10 people reported dead and 80 houses destroyed
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