The state is bisected by religious hatred focused on the stateless Rohingya Muslim minority, who are reviled by many Buddhists and perceived as illegal immigrants.
Recent weeks have seen tensions surge with near daily killings by shadowy groups operating in remote villages, while Myanmar's army has poured more troops into the area sparking a renewed exodus of refugees.
In the early hours of today more than 20 police posts came under attack by an estimated 150 insurgents, some carrying guns and using homemade explosives, Myanmar's military said.
"Bengali terrorists" is the state's description of the Rohingya militants.
The office of de-facto leader Aung San Suu Kyi said 12 security officials had been killed alongside 59 militants.
One resident in Maungdaw, the main town in northern Rakhine, said gunfire could be heard throughout the night.
"We are still hearing gunshots now, we dare not to go out from our house," the resident said by phone, asking not to be named.
Despite years of persecution, the Rohingya largely eschewed violence.
A Twitter account which frequently posts purportedly from the group - @ARSA_official - today morning confirmed its fighters were engaging Myanmar's military in Rathedaung township.
It accused the military of carrying out atrocities in that area in recent weeks.
Today's violence pushed more Rohingya to leave, with two boats containing around 150 women, children and elderly people attempting to cross the Naf river into Bangladesh.
"They were scared. We felt pain to send them back," a Border Guard Bangladesh (BGB) officer told AFP.
The flare up came just hours after former UN chief Kofi Annan released a milestone report detailing conditions inside Rakhine and offering ways to heal the festering sectarian tensions there.
Commissioned by Myanmar's own government, it urged the scrapping of restrictions of movement and citizenship imposed on the roughly one million-strong Rohingya community in Rakhine.
In a statement Annan said he was "gravely concerned" by the latest outbreak of fighting.
"The alleged scale and gravity of these attacks mark a worrying escalation of violence," he said.
The wedge of Rakhine closest to Bangladesh has been in lockdown since October 2016.
Deadly attacks by the militants on border police sparked a military response that left scores dead and forced tens of thousands to flee to Bangladesh.
The UN believes those security 'clearances' may have amounted to ethnic cleansing of the Rohingya, a mainly Muslim minority living in Buddhist Myanmar.
The army and Aung San Suu Kyi's civilian government vehemently deny allegations of widespread abuses, including rapes and murders.
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