In the once mixed ethnicity village of Inn Din - where Amnesty International has documented how security forces and their proxies killed Rohingya villagers and torched their homes in late August and early September 2017 - satellite imagery shows what appears to be a new security force base being built where the Rohingya part of the village used to be. "New bases are being erected to house the very same security forces that have committed crimes against humanity against Rohingyas".
Amnesty said the developments in Rakhine were likely to signal further persecution when the Rohingya refugees return.
"In some of the camps that have been established to receive refugees back, these are in highly militarised zones with a lot of security factors around it", said Mr O'Gorman.
Almost 700,000 Rohingya Muslims have fled northern Rakhine state to Bangladesh since Myanmar launched a brutal crackdown on insurgents six months ago that the U.S. and United Nations have called ethnic cleansing.
(COMBO) This handout image of a satellite photograph released by Amnesty International and DigitalGlobe on March 12, 2018 shows new structures and fencing built over the previously burnt village of Kan Kya in Myanmar's Rakhine State.
The global rights watchdog said although the violence in Rakhine State has subsided, the campaign to drive Rohingya out of their homeland - and ensure they can not return - continues but has taken on new forms.
Repatriations were scheduled to begin during the fourth week of January, but have yet to start on account of various delays for which officials from each side have blamed the other.
"What we are seeing in Rakhine State is a land grab by the military on a dramatic scale", Tirana Hassan, Amnesty's crisis response director, said in a statement, adding how the new construction makes the much-debated return of Rohingya refugees even more impossible.
"Not only are their homes gone, but the new construction is entrenching the already dehumanizing discrimination they have faced in Myanmar", Hassan added.
The quest for accountability "must be aimed at the individuals who gave the orders and carried out violations against individuals and entire ethnic and religious groups", Lee said.
Lee called for a thorough, impartial and credible investigation to be conducted without delay and perpetrators to be held responsible for the alleged crimes that were committed in Rakhine State since October 9 in 2016 and August 25 a year ago, and for the violations that continue today.
The South Korean academic, who has been barred from visiting Myanmar, called for a UN-backed investigation based in Bangladesh.
"It is unreasonable to assert that our leadership, whose mission has human rights at its core, remains indifferent to the allegations of grave human rights violations", he said, insisting that the government was "ready to take action where there is clear evidence".