A fire has raced through a sprawling Rohingya refugee camp in southern Bangladesh destroying hundreds of homes, officials said.

No casualties were reported, but the UNHCR said more than 550 homes sheltering about 3,500 people as well as 150 shops were totally or partially destroyed in the fire.

The fire broke out early on Thursday in Nayapara Camp in the Cox’s Bazar district, where more than a million Rohingya refugees from Myanmar are staying. Nayapara is an old camp that was started decades ago.

Mohammed Shamsud Douza, a senior refugee official, said firefighters took two hours to bring the blaze under control.

No serious injuries were reported, and the cause of the fire was not immediately known.

The UN agency said affected families were being provided shelter materials, winter clothes, hot meals and medical care.

A video showed many refugees searching through charred corrugated iron sheets for valuables.

“This is another devastating blow for the Rohingya people who have endured unspeakable hardship for years,” Save the Children’s country director in Bangladesh, Onno van Manen, said in a statement.

“Today’s devastating fire will have robbed many families of what little shelter and dignity was left to them.”

About 700,000 Rohingya fled to the camps in Cox’s Bazar after August 2017, when the military in Buddhist-majority Myanmar began a harsh crackdown on the Muslim group following an attack by insurgents.

The crackdown included rapes, killings and the torching of thousands of homes, and was termed ethnic cleansing by global rights groups and the UN.