Rights group Amnesty International has released satellite images which it says show an “orchestrated campaign” to burn Rohingya villages in western Myanmar.
Amnesty said this was evidence security forces were trying to push the minority Muslim group out of the country.
The army says it is fighting militants and denies targeting civilians.
Some 389,000 Rohingya have fled to Bangladesh since violence began last month. They have long been persecuted in Myanmar as “illegal immigrants”.
At least 30% of Rohingya villages in Rakhine state are now empty, the government says.
They have lived in the state in Myanmar, also known as Burma, for generations but are denied citizenship.
Myanmar has faced international condemnation over the crisis.
On Thursday US Secretary of State Rex Tillerson said Myanmar’s democracy was facing a “defining moment”.
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