"It is important for us to see with our own eyes the sites of these alleged violations", the head of UN-backed fact-finding mission, Marzuki Darusman, told the Human Rights Council, asking for "full and unfettered access to the country."
"There is a grave humanitarian crisis underway that requires urgent attention", he added.
The council set up the mission in March to investigate possible violations across Myanmar, with a particular focus on alleged crimes committed against Rohingya Muslims in Rakhine state.
Suu Kyi earlier today delivered a nationally televised address on the Rohingya crisis, appealing for outside observers to visit Myanmar and see the situation for themselves, in a speech aimed at appeasing an international community horrified by the army-led violence in Rakhine.
But hours after that speech, Myanmar's UN ambassador Htin Lynn re-asserted his government's "position of disassociating herself from the resolution" that set up the fact-finding mission.
"We continue to believe that instituting such a mission is not a helpful course of action in solving the already-intricated Rakhine issue", he told the council.
He added that the probe "had urgently dispatched a team to Bangladesh", where more than 400,000 Rohingya have fled army operations in recent weeks.
The UN investigator, an Indonesian national and veteran of past UN investigations including a ground-breaking report on slave labour in North Korea, warned that Myanmar had the "danger signs" of a crisis that could worsen.
He noted reports that some in majority Buddhist Myanmar had spread propaganda that "compared the Rohingya to pests".
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