A senior U.N. human rights official is urging the international community to maintain pressure on Myanmar’s government to halt atrocities against Rohingya Muslims and facilitate their return home.

“Clearly, there has to be sustained international pressure on the government of Myanmar to prevent its security forces from carrying out the actions that they are carrying out,” Assistant Secretary-General for Human Rights Andrew Gilmour told VOA on Thursday. “And to enable, to genuinely, not just say it, but to genuinely permit the conditions for the refugees to return.”

Gilmour returned this week from a four-day visit to Cox’s Bazar in Bangladesh, where nearly a million Rohingya Muslim refugees are living in what has become the world’s largest refugee camp.

Some 700,000 Rohingya have fled Myanmar since August 25, after attacks by Rohingya militants on state security forces led to military reprisals that the United Nations says were executed in a well-organized, systematic and coordinated manner and are a “textbook example” of ethnic cleansing.

Survivors and witnesses have given harrowing accounts of security forces killing and raping Rohingya while looting and burning their villages in northern Rakhine state. The Rohingya are one of many ethnic minorities in Buddhist-majority Myanmar. They are considered to be economic migrants from Bangladesh and have been denied citizenship in Myanmar, even though most can show that their families have been in the country for generations.

Gilmour said the Rohingya who have not left Rakhine are now being deprived of food.

“It’s a policy of forced starvation,” he said. “And it is a crime against humanity.”

He said aid agencies have had no access for months to Rakhine. Farmers have had their fields confiscated by the authorities, and their animals have been stolen or killed. In other cases, Rohingya are prevented from leaving their villages — sometimes even their homes — to prevent them from working so they can buy food. Their dire circumstances are forcing many who remained after August to flee now.

The United Nations has had little success getting into Rakhine.

“Since June, we’ve not had one single person allowed there by the Myanmar government,” Gilmour said, referring to the U.N. Office of Human Rights.

A fact-finding mission set up by the U.N. Human Rights Council has not gotten in, and the government dismissed a request last month from the Security Council to visit, saying it was “not the right time.”

“There is clearly a lot to conceal going on and the concealing is happening,” Gilmour said.

He said for now, the right conditions “clearly do not exist” for the Rohingya to return home in a safe and voluntary manner.

Until they can, he stressed that there must be adequate international support for Bangladesh, which is hosting the refugees.

Work is also being done to document the human rights violations that have been perpetrated against the Rohingya.

The U.N. human rights office is deploying a team to Cox’s Bazar to collect testimony from survivors.

Gilmour is also urging that in addition to the fact-finding mission, an independent international investigative mechanism should be set up to look into individual accountability. A similar mechanism is in place for crimes committed in Syria.