A landslide-affected Afghan villager looks on at the scene of the incident in Argo district in Badakhshan on May 4, 2014.
Much of Aab Bareek village in Badakhshan province was swallowed on Friday by a fast-moving tide of mud and rock that swept down the hillside and left almost no trace of 300 homes.
Government officials said the current death toll was at least 300 and warned it could rise by hundreds more, after initial reports suggested that as many as 2,500 people may have died.
Large crowds gathered at the remote disaster site, where rescue efforts were abandoned due to the volume of deep mud covering houses.
Only a few dead bodies have been pulled from the debris.
"Around 1,000 families are thought to have been affected with some 300 houses totally destroyed," the United Nations Office for the Coordination of Humanitarian Affairs said in a statement.
"Assessments to determine priorities on immediate child protection and water, sanitation, and hygiene needs for (displaced) families are continuing."
It added that 700 families were displaced, with many fleeing their homes in fear that the unstable hillside could unleash more deadly landslides.
Tents, emergency food supplies, health services and support for children who lost parents were being organised after many survivors spent another night in the open.
Wailing near her father's destroyed house, Begum Nisa, a 40-year-old mother of three, described the moment when the wall of mud smashed through the village.
"I was eating lunch by the window of my house, then suddenly I heard a huge roar," she said.
"I shouted to my family to save themselves, but it was too late. I have lost my dear father and mother. I also lost my uncle and five members of his family."
Local people and emergency workers had used shovels to try to dig out anyone trapped alive but without success, and relief work turned to caring for survivors.
- 'Our life is destroyed' -
Supplies began arriving as aid groups struggled to reach the village via poor mud roads that were unable to take heavy vehicles.
Many villagers were at Friday prayers in two mosques when they were engulfed by the torrent of mud, and a second landslide hit people who assisted those in need.
"Our house were totally destroyed, we are destroyed and our life is destroyed," said Bibi Khanum, 55, sitting in a tent provided by the Red Crescent aid agency.
"My husband was killed under the rubble and four of my young children. I am going crazy without them, repeating their names time and time again."
Afghanistan held a national day of mourning on Sunday after President Hamid Karzai expressed his condolences to those who had lost loved ones.
"We have a list of around 300 people confirmed dead," Badakhshan governor Shah Waliullah Adeeb told reporters at the scene on Saturday.
"We cannot continue the search and rescue operation anymore, as the houses are under metres of mud."
Badakhshan is a mountainous province in northeast Afghanistan bordering Tajikistan, China and Pakistan.
It has been relatively peaceful since the US-led military intervention began in 2001, but has seen increasing Taliban activity in recent years.
The landslides follow recent severe flooding in other parts of northern Afghanistan, with 150 people dead and 67,000 people affected by floods in Jowzjan, Faryab and Sar-e-Pul provinces.
Flooding and landslides often occur during the spring rainy season in northern Afghanistan, with flimsy mud houses offering little protection against rising water levels and torrents of mud.
Afghanistan is in the middle of presidential elections, with former foreign minister Abdullah Abdullah and ex-World Bank economist Ashraf Ghani due to compete in a head-to-head vote on June 7.
Both candidates called for urgent action to support those affected by the landslide.
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