A picture of large scale destruction is emerging in the Indonesian city of Palu, after a quake and tsunami struck on Friday.
At least 832 people are confirmed to have died but that figure is expected to rise sharply as more remote areas are reached.
The authorities have said they will begin burying victims in mass graves, fearing disease could begin to spread.
Dozens of people are thought to be trapped alive under the rubble.
In Palu, rescuers are awaiting heavy machinery to search the ruins of a hotel and a shopping centre as aftershocks made it unsafe for them to go in.
A tsunami warning had been issued after the magnitude 7.5 earthquake hit on Friday, but it is unclear whether it was still in place when the waves hit.
Videos show people screaming as 6m-high waves power over the beach – where a festival was being set-up – sweeping up everything in their path.
Indonesian President Joko Widodo visited the region to urge a “day and night” effort to rescue survivors.
Mr Widodo has also agreed to accept international help for disaster response and relief, Thomas Lembong, the head of the Indonesian investment board said on Twitter on Monday.
Lying on a stretcher in the dark outside the Mamboro health clinic in Palu is a five-year-old girl with a broken leg. She was found alone, Doctor Sasono tells me. “We don’t know where her family is and she doesn’t remember where is lives.” His clinic has no power and is running out of medical supplies.
A few metres from her stretcher bed are rows of bodies in bags. The smell of decomposing bodies fills the air.
Dr Sasono says they will be buried in mass graves to stop the spread of diseases: “They are starting to smell. We want to wait for relatives to pick them up but we can’t wait any longer.”
One volunteer, Thalib Bawano, told AFP news agency that three people had been rescued from the hotel rubble, where more than 50 people may be trapped.
“We also heard voices at several points, including a child,” he said.
“They were asking for help, but they are still there till now. We gave them motivation… so they can have spirit because they are trapped between life and death.”
“We gave them water and food but that’s not what they wanted. They wanted to get out. ‘We want to get out, out, out. Help! Help!’ they kept screaming. That’s what we heard. Some were just knocking.”
What are the other challenges?
In Palu, people have been sleeping in the open, wary of returning to their homes, even if they are still intact.
With hospitals damaged, injured people have been treated in the open and at least one military field hospital has been set up.
The military has taken over the airport to fly aid in, and injured people and other evacuees out.
“What you’ll see, you know, as the days go by and people don’t have access to adequate hygiene supplies, shelter, you’ll see the situation deteriorate if they don’t get that access so, we’ve sent shelter kits,” Tom Howells, programme director for Save The Children, said on Sunday.