The death toll from landslides in a remote region of southern Ethiopia has risen to 257, the United Nations said Thursday, warning that the number of victims could soar to up to 500.

Rescuers are pressing on with the grim search for bodies and survivors in the stricken locality of Kencho Shacha Gozdi, with crowds of distraught locals digging through a sea of mud often using just their bare hands and shovels.

OCHA said more than 15,000 people need to be evacuated because of the high risk of further landslides, including at least 1,320 children under the age of five and 5,293 pregnant women or new mothers.

Aid has begun arriving in the isolated, hard-to-reach area, including four trucks of life-saving supplies from the Ethiopian Red Cross Society, it said.

The landslide is the deadliest on record in Ethiopia, Africa's second most populous nation which is often battered by climate-related disasters.

- Bodies wrapped in shrouds -

Officials have said that most of the victims were buried after they rushed to help after the first landslide, which followed heavy rains Sunday in the area roughly 480 kilometres (270 miles) from the capital Addis Ababa -- about a 10-hour drive.

In one graphic scene shown in images posted on social media by the local authority, dozens of men surrounded a pit where human limbs were exposed in the mud.

Other villagers carried bodies on makeshift stretchers while in a nearby tent women wailed as they sat near a row of bodies wrapped in shrouds being prepared for burial.

OCHA said 12 people who sustained injuries had been taken to a local hospital, while at least 125 are displaced and sheltering with other local residents.

The number of missing is not known.

Bd pratidin English/Lutful Hoque