The rights group says that 135,000 Rohingya and Kaman Muslims have been detained arbitrarily and indefinitely in the Rakhine State camps for ten years.
At least 450 Rohingya celebrating the end of Ramadan were detained by Bangladeshi authorities in the latest clampdown against refugees in the country.
Police are investigating the cause of a riot at a detention centre in northern Malaysia after more than 500 refugees escaped.
The measures come as Washington increasingly punishes the military both for the February 2021 coup that ousted Aung San Suu Kyi and violence against the Muslim Rohingya minority.
Rohingya refugees in Bangladesh say path to take action by the international community against Myanmar military has opened up because of the US declaration.
The evidence shows "a clear intent behind these mass atrocities - the intent to destroy Rohingya, in whole or in part," Blinken said.
Secretary of State Antony Blinken will announce the decision at the US Holocaust Memorial Museum in Washington, US officials say, which currently features an exhibit on the plight of the Rohingya Muslim minority.
A fire burned down 1,200 houses, affecting about 5,000 people, in Bangladesh's Cox's Bazar, a border district where more than a million Rohingya refugees live.
More than 3,000 Rohingya-run shops have been bulldozed by Bangladeshi authorities since last month, the country's deputy refugee commissioner Shamsud Douza has confirmed.
Broken-down wooden boat carrying 120 refugees was towed by a navy ship to North Aceh sea port, officials say.
The authorities reversed their decision a day after saying they would not allow the refugees on the boat to seek refuge in the Southeast Asian country, despite international pleas to do so.
The boat carrying at least 100 refugees was intercepted by Indonesian authorities after it ran into trouble off the coast of the Aceh province.
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