Afghan children stand outside their mud houses on World Children's Day in Kabul, capital of Afghanistan, Nov. 20, 2018. (Photos: Xinhua/Rahmat Alizadah)

Afghan children play outside their mud houses on World Children's Day in Kabul, capital of Afghanistan, Nov. 20, 2018.

The United Nations Children's Fund (UNICEF) office in Afghanistan said on Monday that about 3.7 million Afghan children have no access to school due to insecurity and poverty in the country.

Afghan children stand outside their mud houses on World Children's Day in Kabul, capital of Afghanistan, Nov. 20, 2018.

Afghan children stand outside their mud houses on World Children's Day in Kabul, capital of Afghanistan, Nov. 20, 2018.

Afghan children stand outside their mud houses on World Children's Day in Kabul, capital of Afghanistan, Nov. 20, 2018.

Afghan children play outside their mud houses on World Children's Day in Kabul, capital of Afghanistan, Nov. 20, 2018.

An Afghan child stands outside his mud house on World Children's Day in Kabul, capital of Afghanistan, Nov. 20, 2018.

Afghan children are seen on World Children's Day in Kabul, capital of Afghanistan, Nov. 20, 2018.

Afghan children stand outside their mud houses on World Children's Day in Kabul, capital of Afghanistan, Nov. 20, 2018.