Myanmar's army has replaced the general in charge of Rakhine state.

It follows a military crackdown that has driven more than 600,000 Rohingya Muslims into neighbouring Bangladesh and comes amid reports of mass rape, torture and other crimes against humanity.

No reason was given for Major General Maung Maung Soe being transferred from his post as the head of Western Command in Rakhine.

The state saw Myanmar's military, known as the Tatmadaw, launch a sweeping counter-insurgency operation in August.

"I don't know the reason why he was transferred," said Major General Aye Lwin.

"He wasn't moved into any position at present. He has been put in reserve."

The move comes ahead of a visit on Wednesday by US Secretary of State Rex Tillerson.

Mr Tillerson is expected to deliver a stern message to Myanmar's generals, over whom national leader Aung San Suu Kyi, criticised in the West for failing to halt the atrocities, has little control.

Senators in Washington are pressing to pass legislation imposing economic and travel sanctions targeting the military and its business interests.

The government in mostly-Buddhist Myanmar regards the Rohingya as illegal immigrants from Bangladesh.

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A senior UN official has described the army's actions in Rakhine as a textbook example of ethnic cleansing.

Myanmar says the clearance operation was necessary for national security after Rohingya militants attacked 30 security posts and an army base in the state on 25 August.
Yesterday, another UN official accused Myanmar's military of conducting organised rape and other crimes against humanity, and said she would raise the matter with the International Criminal Court in the Hague.
"When I return to New York, I will brief and raise the issue with the prosecutor and president of the ICC whether they (Myanmar's military) can be held responsible for these atrocities," Pramila Patten, Special Representative of the Secretary-General on Sexual Violence in Conflict, said in Dhaka.
"Sexual violence is being commanded, orchestrated and perpetrated by the Armed Forces of Myanmar, otherwise known as the Tatmadaw," Ms Patten said following a three-day tour of theRohingya refugee camps in the Cox's Bazar region of Bangladesh.
"Rape is an act and a weapon of genocide," she said.
Refugees have accused Myanmar soldiers and Buddhist vigilantes of torching their villages, murdering their families and raping women.
Ms Patten said brutal acts of sexual violence had occurred in the context of collective persecution that included the killing of adults and children, torture, mutilation and the burning and looting of villages.
"The forms of sexual violence we consistently heard about from survivors include gang-rape by multiple soldiers, forced public nudity and humiliation, and sexual slavery in military captivity. One survivor was in captivity for 45 days by the Myanmar army," Ms Patten said.