KABUL — Rescuers in Afghanistan will try to reach isolated villages on Tuesday in the eastern region of Kunar, the epicenter of an earthquake that has killed over 1,400 people and injured more than 3,000, authorities said on Tuesday.

Rescue operations were carried out in four villages in Kunar on Monday after the quake struck and efforts will now be focused on reaching more remote mountain areas, said Ehsanullah Ehsan, the provincial head of disaster management.

"We cannot accurately predict how many bodies might still be trapped under the rubble," said Ehsan. "Our effort is to complete these operations as soon as possible and to begin distributing aid to the affected families."

One of Afghanistan's worst earthquakes, with a magnitude of 6, struck around midnight local time on Monday, at a shallow depth of 10 kilometers, killing at least 1,411 people in the eastern provinces of Kunar and Nangarhar.

Mountainous terrain and inclement weather have hindered rescuers from reaching remote areas along the Pakistani border where the quake flattened mud-brick homes.

Gaining access for vehicles on the narrow mountain roads was the main obstacle for relief work, said Ehsan, adding machinery was being brought in to clear roads of debris.

On Tuesday, a line of ambulances was on the damaged mountain road trying to reach Kunar villages, as helicopters flew in, bringing aid supplies and taking the injured to hospitals, according to a Reuters witness.

Some of the injured have been transferred to hospitals in Kabul and the adjacent province of Nangarhar, said Ehsan.

Thousands of children were at risk, the United Nations Children's Fund warned on Tuesday.

UNICEF said it was sending medicines, warm clothing, tents and tarpaulins for shelter, and hygiene items such as soap, detergent, towels, sanitary pads, and water buckets.

"Our response focuses on addressing urgent needs across health, safe water, sanitation, nutrition, child protection, temporary shelter, and psychosocial support to ensure that children and families receive life-saving assistance as quickly as possible," Tajudeen Oyewale, UNICEF's representative in Afghanistan, said in a statement.

Taliban soldiers were deployed in the area, providing help and security. The disaster has further stretched the nation, already grappling with a sharp drop in foreign aid.

"National and international organizations are present in the area, have organized their assistance, and, God willing, aid will be distributed in an orderly manner," said Ehsan.

Rescue teams and authorities are trying to dispose of animal carcasses quickly so as to minimize the risk of contamination to water resources, a UN official said on Monday.

"Damaged roads, ongoing aftershocks, and remote locations of many villages severely impede the delivery of aid," the World Health Organization said in a situation update, adding that over 12,000 people had been affected by the quake.

Afghanistan has been badly hit by US President Donald Trump's decision in January to cut funding to its humanitarian arm USAID and reductions in other foreign aid programs.

Humanitarian officials said the shrinking of funding was hampering the response to the quake.

In the wake of the latest disaster, Britain allocated 1 million pounds ($1.35 million) to support the efforts of UN and the International Red Cross in delivering critical healthcare and emergency supplies to affected Afghans.

India delivered 1,000 family tents to Kabul and was moving 15 metric tons of food supplies to Kunar, with more relief materials to be sent on Tuesday.

Afghanistan is prone to deadly earthquakes, particularly in the Hindu Kush mountain range, where the Indian and Eurasian tectonic plates meet. A 6.1-magnitude earthquake that killed 1,000 people in the eastern region in 2022 was the first major natural disaster faced by the Taliban government.

Agencies Via Xinhua