The tiny bodies of slain children, believed to belong to the desperate Muslim families fleeing the Myanmar ‘genocide,’ have reportedly washed up on shores of Bangladesh.

Unverified footage shows crowds of people surrounding the shallows of Naf River as a young boy helps pull lifeless children from the water and lays them on the sand.

An unidentified woman is also seen clinging to a silent infant. It is not clear from the footage as to whether the child is alive or not.

The ABC , which published the video, quotes relatives of the children as claiming the young were shot dead by Myanmar police during the crossing.

Since late last month, about 400,000 Rohingya villagers have escaped Myanmar for Bangladesh, with many of them dying trying.

Anwar Sha, who was reportedly send the footage by relatives, told the ABC he has lost contact with family who were attempting to flee the massacre.

“I hear one of (my) sisters has already crossed to Bangladesh, but two other sisters – I have not heard about them,” Mr Sha, a community leader in Australia, said.

“There is no contact with them and I don’t know where they are.”

He claims the “military and police” are “attacking” and “slaughtering” groups as they attempt to flee.

As well as allegedly opening fire on fleeing refugees, reports continue to emerge of villagers being burnt alive by police.

Deakin University’s Ronan Lee told the ABC the killings were “undoubtedly a genocide” that didn’t look like it would end anytime soon. He added that what was taking place in Myanmar has “all the elements for a long-term catastrophe”.

The United Nations Security Council says it's deeply concerned about violence in Myanmar's Rakhine state, where about 400,000 Rohingya Muslims have been forced to flee to Bangladesh.

In a statement, the 15-member council "expressed concern about reports of excessive violence during the security operations and called for immediate steps to end the violence in Rakhine, de-escalate the situation, re-establish law and order, ensure the protection of civilians".

British UN Ambassador Matthew Rycroft said it was the first time in nine years the council had agreed a statement on Myanmar.

Myanmar leader Aung San Suu Kyi has cancelled a trip to the upcoming UN General Assembly to deal with the crisis, her office said.

The government of Myanmar, also known as Burma, says its security forces are fighting Rohingya militants behind a surge of violence in Rakhine state that began on August 25, and they are doing all they can to avoid harming civilians.