The bodies of dozens of students killed when a landslide hit a church have been found in the aftermath of the Indonesian earthquake.

After a 90-minute trek through mud, rescuers recovered 34 bodies from a Bible camp in mountainous Sigi Biromaru district.

More than 840 people have died after Friday's quake and tsunami, according to official figures, but the actual number is believed to be far higher - possibly in the thousands.

Indonesian authorities are scrambling to find survivors and provide shelter, food and water to those who have lost everything.

Image: The earthquake off Sulawesi island triggered a tsunami which hit Palu and Donggala

Image: Indonesia is at the meeting point of several tectonic plates

Meanwhile, four more earthquakes between 5.0 and 6.0 magnitude hit Indonesia late on Monday night, said the US Geological Survey.


The tremors were recorded near Sumba island - hundreds of miles south of Sulawesi, where Friday's quake struck.

There are no details so far on any damage or casualties.

:: Images before and after the earthquake

Mass burials have begun on Sulawesi for the victims recovered so far - nearly all of them found in the city of Palu.

But there are fears many more are buried in mud and trapped under buildings in remote areas that have not yet been accessed.

Image: The grim task of recovering bodies goes on

Blocked roads, damaged bridges and a lack of heavy machinery have held back the rescue effort.

According to UN estimates, around 191,000 people are now in urgent need of help after the quake and tsunami wave - which measured up to 6m (20ft).

Survivors say that supplies are not getting through and that they have been forced to loot from shops.

"The government, the president have come here, but what we really need is food and water," said Burhanuddin Aid Masse, 48.

Signs along roads read "We Need Food" and "We Need Support", and long lines have formed to get a share of remaining petrol supplies.

Man pulled alive from quake rubble

In northern Palu, a man named Zaenal told Sky News that 10 of his relatives had died and 70 neighbours drowned.

"We've had disaster but we haven't had any help. Why isn't the government helping us?" he cried.

"Where is the support for us while we are suffering? We are the unlucky ones. We have already lost our relatives. Where is their heart?"

:: Indonesia tsunami: The shadow of death hangs over Palu

Despite the devastation, some survivors are still being rescued from the rubble.

Image: The coastal city of Palu, home to more than 300,000, was badly hit

A 38-year-old man was pulled from a collapsed building in Palu on Monday, three days after the disaster.

Indonesian TV showed Sapri Nusin conscious and talking as he was rescued from a destroyed finance building.

Another video showed a woman being rescued by torchlight.

The UK is sending a team of experts and £2m in humanitarian aid to the country.

International Development Secretary Penny Mordaunt told Sky News that the UK had been asked to help and would be sending experts to co-ordinate efforts on the ground.