The Myanmar government have launched a crackdown in the north of Rakhine State, on the border with Bangladesh, in October, 2016 after nine policemen were killed in attacks on border posts, in which the government blamed on Rohingya supported by foreign militants.
The government, led by Nobel laureate Aung San Suu Kyi, has said the allegations are invented and has resisted mounting global pressure to protect the minority. "I called upon her to use every means available to exert pressure on the military and the security services to end this operation". "If evidences of the violations are found we will definitely take action on them", she told CNN.
Zeid said the perpetrators of such "horrors" must be held to account.
In Myanmar's former capital, Yangon, presidential spokesman Zaw Htay said: "These are extremely serious allegations, and we are deeply concerned". Plans to deliver the remainder to Rakhine state, where the Rohingya are located, and across the border in Bangladesh, appeared blocked.
Myanmar's military launched "area clearance operations" the next day, which the United Nations report said "have likely resulted in several hundred deaths".
Myanmar refuses to recognise the Rohingya as one of the country's ethnic minorities, instead describing them as Bengalis - or illegal immigrants from neighbouring Bangladesh - even though many have lived in Myanmar for generations.
"This is a historic moment. a noble effort that shows that all the pain and suffering of Rohingya in Myanmar will not go ignored", Najib said in a speech at a port near the capital of mostly Muslim Malaysia.
Four U.N. investigators gathered testimony last month from 220 Rohingya victims and witnesses who fled the "lockdown area" in Maungdaw in Rakhine for the Cox's Bazar district in Bangladesh.
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OHCHR noted that more than half of the women its human rights team interviewed reported having suffered rape or other forms of sexual violence.
The report's authors said most of the people interviewed accused the security forces, not civilians, of the crimes.
They include images of bullet and knife wounds, burns and injuries resulting from beatings with rifle butts or bamboo sticks.
Is there global support for the Rohingya?
Yangon's own probe into the unrest denied that the security forces had carried out a genocidal campaign against the Rohingya.
Rights office researchers interviewed 204 Rohingya refugees in Bangladesh, where almost 70,000 people have fled during the four-month crisis.
"The Malaysian government expresses its appreciation to the Bangladeshi government for its willingness to allow the food flotilla to provide humanitarian aid to the Rohingya refugees around Teknaf port", the statement said.