The death toll from Indonesia's quake and tsunami jumped to 384, the disaster agency said Saturday (Sep 29), as hospitals struggled to cope with hundreds of injured and rescuers scrambled to reach the stricken region.

People walk past dead bodies (blue cover) a day after a tsunami hit Palu, on Sulawesi island on September 29, 2018. (Photo: AFP / OLA GONDRONK)

So far, it said all the deaths were recorded in tsunami-struck Palu, a day after waves 1.5m (five feet) high slammed into the city of 350,000 in central Sulawesi island.

The national disaster agency had earlier put the official death toll - based on reports from medical facilities in the tsunami-struck city of Palu - at 48, but warned the toll was likely to rise.

In the city - home to around 350,000 people - partially covered bodies lay on the ground near the shore.

Hospitals were overwhelmed by the influx of injured, with many people being treated in the open air, while other survivors helped to retrieve the remains of those who died.

One man was seen carrying the muddy corpse of a small child.

The tsunami was triggered by a strong quake that brought down buildings and sent locals fleeing for higher ground as a churning wall of water crashed into Palu, where there were widespread power blackouts.

Giving its first official death toll, Indonesia's national disaster agency said at least 48 people had been killed in Palu, while so far another 356 people had been injured.

It cautioned that there would likely be many more deaths.

Dramatic video footage filmed from the top floor of a parking ramp in Palu, nearly 80 kilometres (50 miles) from the quake's epicentre, showed waves of water bring down several buildings and inundate a large mosque.

"I just ran when I saw the waves hitting homes on the coastline," said Palu resident Rusidanto, who like many Indonesians goes by one name.

The shallow 7.5-magnitude tremor was more powerful than a series of quakes that killed hundreds on the Indonesian island of Lombok in July and August.

Indonesian president Joko Widodo said the military was being called in to the disaster-struck region to help search-and-rescue teams get to victims and find bodies.

Earlier, the head of the country's search and rescue agency Muhammad Syaugi told AFP that local staff had found "many" dead bodies.

People living hundreds of kilometres from the epicentre reported feeling the massive shake, which came hours after a smaller jolt killed at least one person in the same part of the country.

The quake hit just off central Sulawesi at a depth of 10km just before 1100 GMT - early evening in Sulawesi - the U.S. Geological Survey said. Such shallow quakes tend to be more destructive.

Pictures supplied by the disaster agency showed a badly damaged shopping mall in Palu where at least one floor had collapsed onto the storey below, while other photographs showed major damage to buildings and large cracks across pavements.

The agency also said homes and a local hotel were flattened while a landmark city bridge was destroyed.

A key road into the settlement had been badly damaged and was blocked by landslides, the disaster agency said.

Medical team members help patients outside a hospital after an earthquake and a tsunami hit Palu, on Sulawesi island on Sep 29, 2018. (Photo: AFP / MUHAMMAD RIFKI)

AIRPORT CLOSED

The main airport in Palu was shut after the tsunami struck and was expected to stay closed for at least 24 hours, complicating any disaster relief efforts.

Friday's tremor was centred 78km north of Palu, the capital of Central Sulawesi province, but was felt in the far south of the island in its largest city Makassar and on the neighbouring island of Kalimantan, Indonesia's portion of Borneo island.

The initial quake, which was followed by a series of powerful aftershocks, struck as evening prayers were about to begin in the world's biggest Muslim majority country on the holiest day of the week, when mosques are especially busy.

Indonesia is one of the most disaster-prone nations on earth.

It lies on the Pacific "Ring of Fire", where tectonic plates collide and many of the world's volcanic eruptions and earthquakes occur.

Earlier this year, a series of powerful quakes hit Lombok, killing more than 550 people on the holiday island and neighbouring Sumbawa.

Some 1,500 people were injured and about 400,000 residents were displaced after their homes were destroyed.

Indonesia has been hit by a string of other deadly quakes including a devastating 9.1-magnitude tremor that struck off the coast of Sumatra in December 2004.

That Boxing Day quake triggered a tsunami that killed 220,000 throughout the region, including 168,000 in Indonesia.

The disaster was the world's third biggest quake since 1900, and lifted the ocean floor in some places by 15 metres.

In 2010, about 430 were killed when a 7.8-magnitude quake triggered waves that pound the isolated region of Mentawai, off the coast of Sumatra.

More than 600 were killed in 2006 when another large quake triggered a tsunami off the coast of Indonesia's most-populous Java island./.

VNF/AFP