The death toll of children in last week’s devastating earthquake in southeastern Afghanistan has risen to at least 155, the United Nations said as the scope of the deadliest quake to hit the impoverished country in two decades comes into focus.

The UN’s humanitarian coordination organization, OCHA, said on Sunday that another 250 children were injured in the magnitude 6 temblor that struck the mountainous villages in the Paktika and Khost provinces near the country’s border with Pakistan, flattening homes and triggering landslides. Most of the children died in Paktika’s hard-hit Gayan district, which remains a scene of life in ruins, days after the quake.

Afghanistan’s Taliban rulers have put the total death toll from the quake at 1,150, with hundreds more injured, while the UN has offered a slightly lower estimate of 770, although the world body has warned the figure could still rise.

The quake has also left an estimated 65 children orphaned or unaccompanied, the UN humanitarian office added.

The disaster — the latest to convulse Afghanistan after decades of war, hunger, poverty, and an economic crash — has become a test of the Taliban’s capacity to govern and the international community’s willingness to help.

Aware of their limitations, the Taliban has appealed for foreign aid. The UN and an array of overstretched aid agencies in the country that have tried to keep Afghanistan from the brink of starvation have swung into action. Despite funding and access constraints, convoys of aid have trickled into the remote provinces.