Iraq crisis: Where have the Yazidi refugees gone?
14 August 2014 Last updated at 19:03 BST
The UN has declared its highest level of emergency in Iraq because of the humanitarian crisis triggered by the advance of Islamic State (IS) in the north.
Kurdish officials say the situation in the city of Dohuk is now critical, after 150,000 displaced people arrived there.
The BBC's world affairs correspondent Caroline Wyatt spent the day at a hospital where the doctors have been treating Yazidi refugees.