The United Nations says aid workers are still in a "race against time" to remove rubble and rebuild after the devastating earthquake struck eastern Afghanistan last month, killing at least 2,200 people and cutting off remote areas.

The 6.0-magnitude quake on Aug. 31 was shallow, destroying or causing extensive damage to low-rise buildings in the mountainous region. It hit late at night, and homes -- mostly made of mud, wood, or rocks -- collapsed instantly, becoming death traps.

Satellite data shows that about 40,500 truckloads of debris still needs to be cleared from affected areas in several provinces, the United Nations Development Program said Wednesday. Entire communities have been upended and families are sleeping in the open, it added.

The quake's epicenter was in remote and rugged Kunar province, challenging rescue and relief efforts by the Taliban government and humanitarian groups. Authorities deployed helicopters or airdropped army commandos to evacuate survivors. Aid workers walked for hours on foot to reach isolated communities.

"This is a race against time," said Devanand Ramiah, from the UNDP's Crisis Bureau. "Debris removal and reconstruction operations must start safely and swiftly."

People's main demands were the reconstruction of houses and water supplies, according to a spokesman for a Taliban government committee tasked with helping survivors, Zia ur Rahman Speenghar.

People were getting assistance in cash, food, tents, beds, and other necessities, Speenghar said Thursday. Three new roads were under construction in the Dewagal Valley, and roads would be built to areas where there previously were none.

"Various countries and organizations have offered assistance in the construction of houses but that takes time. After the second round of assistance, work will begin on the third round, which is considering what kind of houses can be built here," the spokesman said.

Afghanistan is facing a "perfect storm" of crises, including natural disasters like the recent earthquake, said Roza Otunbayeva, who leads the U.N. mission to the country.

In a briefing to the U.N. Security Council on Wednesday, Otunbayeva said the development of Afghanistan's full potential was required for it to address restrictions on personal freedoms, aid cuts, a struggling economy, climate-related stressors, and " significant population returns " from neighboring countries.