Volunteers have begun burying victims of Indonesia's deadly earthquake and tsunami in a mass grave.
The disaster devastated swathes of Sulawesi island and has left at least 844 people dead.
Four days after the natural disaster hit, some remote areas have yet to be contacted.
A lack of heavy lifting equipment is hampering rescuers' attempts to reach people who remain alive in the ruins of collapsed buildings.
Dozens of people are feared to be underneath the rubble of one hotel alone, the Roa-Roa in the devastated coastal resort of Palu.
"Communication is limited, heavy machinery is limited… it's not enough for the numbers of buildings that collapsed," said Sutopo Purwo Nugroho, spokesman for the National Disaster Mitigation Agency.
Yenni Suryani, of Catholic Relief Services, said aid agencies were struggling to get staff into affected areas as the main airport at Palu was damaged, landslides had cut road links and "power is out almost everywhere".
Some survivors have been looting shops for food, water and fuel, telling reporters they have run out of supplies.
Reuters news agency reports that police are escorting aid convoys to prevent supplies being stolen.
President Joko Widodo has welcomed offers of international help.
On a visit to the region, the president urged a "day and night" effort to rescue survivors.
Meanwhile, government officials say some 1,200 inmates escaped from three prisons in the region as the quake struck.