A huge fire caused widespread damage as it swept through Rohingya refugee camps in Cox's Bazar, southern Bangladesh.
People scrambled to recover their possessions amid thousands of burning shanties and tents as they ran for their lives.
The UN said health centers and other facilities were also destroyed.
A Rohingya leader in Cox's Bazar said he saw several dead bodies and that thousands of huts had burned down.
More than a million Rohingya live in the mainland camps in southern Bangladesh.
The vast majority having fled Myanmar in 2017 from a military-led crackdown that U.N investigators said was executed with "genocidal intent."
Myanmar denies these charges.
The risk of fire in the densely populated camps is high.
Another large blaze tore through the camp in January.
This one is the largest yet.