"Myanmar's top military generals, including Commander-in-Chief Senior General Min Aung Hlaing, must be investigated and prosecuted for genocide in the north of Rakhine State, as well as for crimes against humanity and war crimes in Rakhine, Kachin and Shan States", the report said.
The investigators named six of the country's top military commanders, adding that a longer list of names could be shared with "any competent and credible body pursuing accountability in line with worldwide norms and standards".
Human Rights Watch has called on the UN Security Council and concerned governments to adopt an arms embargo and targeted sanctions, including travel bans and asset freezes, against Myanmar military commanders implicated in abuses, and to refer the situation to the ICC.
But in a trial that has commanded an global spotlight and is widely seen as a litmus test for the civilian government's relationship with the press, the delay was widely perceived to have political motivations, especially as the decision comes on the eve of the U.N. Security Council briefing on Myanmar.
Yangon-based political analyst David Mathieson said that Facebook's action, together with the damning United Nations report, force Myanmar's military brass "into an isolation they're not going to like".
It extended culpability for the humanitarian crisis in Rakhine state to Myanmar's civilian government, led by Nobel Peace Prize laureate Aung San Suu Kyi.
"Unless impunity is addressed, and all ranks within the security forces are held accountable for their past, current and future actions, similar outbreaks of violence and associated atrocity crimes can be expected to continue, with further devastating domestic and regional impact", the report states. Reuters was also unable to contact the six generals named in the report.
The Rohingya, who regard themselves as native to Rakhine state, are widely considered as interlopers by Myanmar's Buddhist majority and are denied citizenship.
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The crimes documented in Kachin, Shan and Rakhine include murder, imprisonment, torture, rape, sexual slavery, persecution and enslavement that "undoubtedly amount to the gravest crimes under worldwide law".
The fact-finding mission interviewed 875 people, scrutinized satellite images and browsed public statements by Myanmar officials.
"The Rohingya are in a continuing situation of severe, systemic and institutionalised oppression from birth to death", Darusman told reporters. The report said the social media company should have acted quicker. The U.S., which is reportedly mired in its own debate over whether to label the violence "genocide", has accused China of using its veto power to shield Myanmar from censure.
"Facebook has been the key channel enabling the military's communication with the public and this ban will hit their communication ability hard", said Richard Horsey, a Yangon-based independent political analyst and former United Nations diplomat to the country.
The UN report singled out Facebook for its "slow and ineffective" response.
Facebook said on Monday it was making progress on preventing "the spread of hate and misinformation" in Myanmar, admitting it had been "too slow to act".
A total of 18 Facebook accounts - not all the individuals listed in the ban had a presence on the network - one Instagram account and 52 Facebook pages were removed. In the same post, Facebook said the move was meant to prevent inflammatory posts from these accounts.
The fact-finders' report also comes the same day two Reuters journalists were expecting a verdict in a case that could see them imprisoned for up to 14 years after they were arrested while investigating soldiers' participation in a Rohingya massacre.