Hundreds of Iranian children face death as a result of lack of medications due to U.S. sanctions, said Iran’s health minister on Wednesday.

In a letter to World Health Organization head Tedros Adhanom, Saeed Namaki said the unilateral U.S. sanctions block shipments of medication and medical equipment.

Contrary to U.S. claims that sanctions do not hinder medication and food trade, he said global firms don’t sell medication or medical equipment to Iran as a result of the the unilateral sanctions.

Read more: 'Iranian children have death risk under US sanctions'