An international human rights group says fighting in Afghanistan has displaced half a million people who now lack access to adequate housing, food and schools.

London-based Amnesty International said in a report released Thursday that the situation is a “horrific humanitarian and human rights crisis.”

The report said the displaced are living in settlements that lack food, proper sanitation and health care, and that at least 28 children have died in harsh conditions in camps around the capital, Kabul.

It also says Afghan government rules have kept humanitarian groups from providing proper aid, and called on officials to remove the barriers.

Amnesty International urged international and Afghan forces to address civilian impacts of the conflict, and for the Taliban to allow aid into areas it controls.