Amnesty International has said the Myanmar authorities' restrictions on international aid in Rakhine state is putting tens of thousands of lives at risk in a region where mainly Rohingya people are already suffering horrific abuses from a disproportionate military campaign.

The London-based human rights organisation came up with the observation at a press statement on its website on Monday.

Updated map of northern Rakhine state showing areas where fires were detected from satellite imagery. Photo: AFP

Quoting aid workers, Amnesty International said an increasingly desperate humanitarian situation has been prevailing in Rakhine state, where the military has been engaged in a large-scale operation since attacks on dozens of security posts on 25 August, claimed by the armed group Arakan Rohingya Salvation Army.

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"Rakhine state is on the precipice of a humanitarian disaster. Nothing can justify denying life-saving aid to desperate people. By blocking access for humanitarian organisations, Myanmar's authorities have put tens of thousands of people at risk and shown a callous disregard for human life," said Tirana Hassan, Amnesty International's Director for Crisis Response.

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"These restrictions will affect all communities in Rakhine State. The government must immediately change course and allow humanitarian organisations full and unfettered access to all parts of the state to assist people in need," Hassan added.

Aid activities have been suspended in the northern part of the state for the last week, while in other parts authorities are denying humanitarian actors access to communities in need, predominantly people from the Rohingya minority.

According to humanitarian workers, restrictions on their activities and access began in early August but deteriorated significantly since the 25 August attacks.

Tens of thousands of people have been forced to flee from their homes since the violence began.

According to latest UN estimates 90,000 Rohingya refugees have crossed the border into Bangladesh, while the Myanmar government has evacuated over 11,000 people belonging to other ethnic minority communities living in northern Rakhine State.

Thousands of people - mostly Rohingya - are believed to be stranded in the mountains of northern Rakhine State, where the UN and international NGOs are unable to assess their needs or to provide shelter, food and protection.

"The Muslims are starving in their homes. Markets are closed and people can't leave their villages, except to flee. There is widespread intimidation by the authorities, who are clearly using food and water as a weapon," a humanitarian official working on Rakhine State told Amnesty International.

Rohingya refugees who have fled into Bangladesh have spoken of witnessing horrific abuses by the Myanmar security forces, including killings of people trying to flee and burning of whole villages.

In late 2016, the Myanmar army launched a vicious campaign in response to an attack by Rohingya militants. At the time, Amnesty International documented violations by the army including rapes, killings, torture and burning of villages, which may have amounted to crimes against humanity.

"The Myanmar military has responded to the militant attacks in a completely disproportionate way. Its campaign of violence is again targeting ordinary Rohingya people on the basis of their ethnicity and religion and must end immediately," said Hassan, Director for Crisis Response.

"The Myanmar authorities are obliged under international law to treat all those living in Rakhine State, including the Rohingya, without discrimination. Instead they have chosen to treat a whole population as an enemy which may be attacked, killed, deprived of homes and uprooted indiscriminately," Hassan added.

The government has further exacerbated the situation by accusing international humanitarian workers of supporting the Rohingya armed group, after INGO-branded food items were found in an alleged militant camp in northern Rakhine State, the press statement said.

"The accusation that international humanitarian organisations are supporting armed actors in Rakhine State is both reckless and irresponsible. Humanitarian workers have for decades supported the Myanmar people, providing aid and assistance in times of need, and often when the government has been unable to do so itself. The Myanmar authorities must immediately stop spreading misinformation and circulating unfounded and inflammatory accusations," said Tirana Hassan.