By PTI

DHAKA: Bangladesh has proposed joint military operations with Myanmar against Rohingya militants fighting in Rakhine state, as the UN raised fears over reports of civilians killed during fresh violence in recent days.

An upsurge in fighting in Rakhine, an impoverished state neighbouring Bangladesh, has been raging since Friday when Rohingya militants staged coordinated ambushes against Myanmar's security forces.

More than 100 people, including around 80 militants, have been confirmed killed in the fightback, which has seen thousands of Rohingya villagers fleeing for Bangladesh.

The United Nation's Secretary-General Antonio Guterres "is deeply concerned at the reports of civilians being killed during security operations in Myanmar's Rakhine State," according to a statement from spokesman Stephane Dujarric.

He called on Bangladesh to step up assistance to civilians escaping the violence, noting "many of those fleeing are women and children, some of whom are wounded".

More than 3,000 Rohingya have arrived in Bangladesh from Myanmar, where the stateless Muslim minority faces persecution, in the past three days, the UN refugee agency said yesterday.

Bangladesh has said there are thousands more Rohingya massed on its border with Myanmar, where it has stepped up patrols and pushed back hundreds of civilians who have tried to enter.

Their flight comes as Human Rights Watch said it has satellite data "consistent with widespread burnings" in 10 populated areas of the violence-wracked wedge of Rakhine State near Bangladesh.

Those include Rohingya villages as well as Rakhine- majority settlements attacked by the militants.

In a meeting with Myanmar's charge d'affaires in Dhaka, a top Bangladeshi foreign ministry official proposed joint military efforts against the militants along the border.

"If Myanmar wished, the security forces of the two countries could conduct joint operations against the militants, any non-state actors or the Arakan Army along the Bangladesh-Myanmar border," a foreign ministry official said on condition of anonymity, as he was not permitted to speak to the media.

The Arakan Rohingya Salvation Army (ARSA) is a militant group that says it is fighting to protect the Muslim minority from abuses by Myanmar security forces and the majority- Buddhist Rakhine community.

There was no comment from the Myanmar diplomat.

At the weekend, as violence in Rakhine worsened, Bangladesh's foreign minister summoned Myanmar's charge'd affaires in Dhaka to express "serious concern" at the possibility of a fresh refugee influx.

There are already some 400,000 Rohingya refugees in Bangladesh in squalid camps near its border with Myanmar.

Bangladesh is waging a bloody crackdown on homegrown Islamist militancy and has vowed 'zero tolerance' towards violent extremism, domestic or otherwise, on its soil.

Dhaka has repeatedly asked Myanmar to take back the Rohingya refugees and address the root causes of problem.

Despite decades of persecution, the Rohingya in Myanmar's western Rakhine state largely eschewed violence.

But in October ARSA, a small and previously unknown militant group, staged a series of well coordinated and deadly attacks on security forces.