Thousands of the refugees were left homeless Sunday after a massive fire broke out at a crammed camp for Rohingya Muslims in southern Bangladesh, a fire official and the United Nations said.

No casualties were reported at the Balukhali camp in Cox’s Bazar district, said Emdadul Haque, a fire service official.

The United Nations High Commissioner for Refugees (UNHCR) in Bangladesh said in a tweet that Rohingya refugee volunteers responded to the fire with the agency and its partners providing support. It provided no further details.

More than 1 million Rohingya refugees have fled to Bangladesh from Myanmar over several decades, including about 740,000 who crossed the border starting in August 2017, when the Myanmar military launched a brutal crackdown.

Conditions in Myanmar have worsened since a military takeover in 2021, and attempts to send back the refugees have failed.

Last year, the United States said the oppression of Rohingya in Myanmar amounts to genocide after U.S. authorities confirmed accounts of mass atrocities against civilians by the military in a systematic campaign against the ethnic minority.

Muslim Rohingya face widespread discrimination in Buddhist-majority Myanmar, where most are denied citizenship and many other rights.