A further 20,000 Rohingya have massed along the Bangladeshi frontier, barred from entering the South Asian country.
A further 20,000 Rohingya have massed along the Bangladeshi frontier, barred from entering the South Asian country, while scores of desperate people have drowned attempting to cross the Naf, a border river, in makeshift boats.
Reports of massacres and the systematic torching of villages by security forces -- as well as by militants -- have further amplified tensions, raising fears that communal violence in Rakhine is spinning out of control.
The office of Commander-in-Chief Min Aung Hlaing on Friday gave an updated death toll, sketching out the details of an insurgency that has escalated sharply.
"Until August 30, a large number of terrorists carried out 52 waves of attacks on security forces .... in those attacks, 370 bodies of terrorists were found and nine others captured alive," a statement posted on Facebook said.
Fifteen security forces and 14 civilians have also died in eight days of fighting, it added.
It was unclear if the deaths of 78 militants killed last Friday in pre-dawn raids on police posts that sparked the current round of violence were included in the toll.
Either way, it is the bloodiest chapter yet in a bitter five-year crisis that has torn apart Rakhine state along ethnic and religious lines, displaced the Rohingya in huge numbers and heaped international condemnation on Myanmar's army and the government of Aung San Suu Kyi.
The UN says 38,000 Rohingya have reached Bangladesh, some using overland routes and others crossing the Naf River.
Rights groups believe the true death toll is likely much higher.
They allege massacres of Rohingya in remote villages led by Myanmar security forces and ethnic Rakhine Buddhist mobs.
Fortify Rights, an NGO with a focus on Myanmar, said eyewitnesses alleged mobs shot and hacked down Rohingya villagers -- including children -- in a five-hour "killing spree" in the village of Chut Pyin in Rathedaung township on Sunday afternoon.
The allegations could not be independently verified by AFP as the area is off-limits to reporters.
Myanmar's Information Committee appeared earlier this week to confirm a major security operation took place around the village on Sunday afternoon as a patrol clashed with scores of Rohingya militants.
But in a complex situation, further muddied by the swirl of claims and denials by both sides, more accounts emerged accusing Myanmar forces of killings and widespread abuse.
A 23-year-old Rohingya woman from Kyet Yoe Pyin said she had witnessed soldiers and Buddhist mobs rape and kill Muslims in her village over the weekend.
"They mercilessly slaughtered men, women and children," she told AFP by telephone from Cox's Bazar in Bangladesh where she has fled. The claims could not be verified by AFP.
Desperate to reach Bangladesh, thousands of Rohingya have taken to boats -- or clung to flotsam -- in an effort to cross the Naf river which separates the two countries.
But others died trying.
Eighteen bodies washed ashore in Bangladesh on Friday, according to Bangladeshi border officials, lifting the toll over the last two days to 41.
More than 400 Hindus from Rakhine have also crossed into Bangladesh, after armed men attacked their village, killing and looting.
It is the first time in Rakhine's bitter and bloody crisis that Hindus have fled -- a sign violence is billowing out.
Thousands of ethnic Rakhine Buddhists and other local ethnic groups have also been displaced -- the apparent targets of militants who are fighting under the banner of the Arakan Rohingya Salvation Army (ARSA).
The latest round of violence erupted last Friday when Rohingya militants swarmed remote police posts, killing 15 officials and burning villages.
Myanmar security forces have launched "clearance" operations to sweep out insurgents whose ranks appear to be swelling as male Rohingya villagers join their cause.
An AFP reporter on a government-led trip to Maungdaw this week saw columns of smoke rising from several burning villages, while terrified Buddhist and Hindu civilians huddled in schools in the main town.
The United States on Thursday urged the military to protect civilians, while Yanghee Lee, the UN's special rapporteur on human rights in Myanmar, expressed fears that "grave violations" could take place.
"The worsening cycle of violence is of grave concern and must be broken urgently," she added.
Rakhine has been the crucible of religious violence since 2012, when riots erupted killing scores of Rohingya and forcing tens of thousands of people -- the majority from the Muslim minority -- into displacement camps.
The ARSA emerged as a force in October last year when their attacks killed Myanmar border police, prompting a crackdown by security forces that killed scores and forced 87,000 people to flee to Bangladesh.
The Rohingya are reviled in Myanmar, where the roughly one million-strong community are accused of being illegal immigrants from Bangladesh.
Bangladesh already hosts 400,000 Rohingya and does not want more