Rohingya refugees in Bangladesh cannot be safely returned to Myanmar because widespread and systematic violence against them amounting to ethnic cleansing is continuing, the senior UN official for human rights has said.

Andrew Gilmour said during a four-day visit to Bangladesh refugees told him “credible accounts of continued killings, rape, torture and abductions, as well as forced starvation” in Rakhine state, western Myanmar.

Myanmar’s government denies such abuses and announced in January it was ready to accept the return of refugees.

Drone footage shows thousands of Rohingya Muslims fleeing Myanmar

Mr Gilour, the UN assistant secretary-general for human rights, added: ”It appears that widespread and systematic violence against the Rohingya persists.

“The nature of the violence has changed from the frenzied blood-letting and mass rape of last year to a lower intensity campaign of terror and forced starvation that seems to be designed to drive the remaining Rohingya from their homes and into Bangladesh.”

Despite Myanmar saying it was ready to accept back refugees under an pact signed with Bangladesh in November, he added: “Safe, dignified and sustainable returns are, of course, impossible under current conditions”.

Bullets and burns: injured Rohingya refugees Show all 10 1 /10 Bullets and burns: injured Rohingya refugees Bullets and burns: injured Rohingya refugees Rohingya refugee Mohamed Jabair, 21, reveals the burns on his bod, which he said he sustained when his house was set on fire in Myanmar REUTERS/Jorge Silva Bullets and burns: injured Rohingya refugees Refugee Momtaz Begum, 30, at Balukhali refugee camp. Begum told how soldiers came to her village demanding valuables.After beating her, they locked her inside her house and set the roof on fire. She escaped to find her three sons dead and her daughter beaten and bleeding REUTERS/Jorge Silva Bullets and burns: injured Rohingya refugees Imam Hossain, 42, sleeps at Kutupalang refugee camp, near Cox's Bazar. Hossain said he was returning home after teaching at a madrassa in his village when three men attacked him with knives REUTERS/Jorge Silva Bullets and burns: injured Rohingya refugees Rohingya refugee Setara Begum, 12, at Nayapara refugee camp. The home of Begum and her siblings was hit by a rocket. The young girl received no treatment for the severe burns to her feet. Her feet healed but she has no toes. Her mother said: 'She has been mute from that day, and doesn't speak to anyone. She only cries silently' REUTERS/Jorge Silva Bullets and burns: injured Rohingya refugees Mohamed Heron, 6, and his brother Mohamed Akter, 4, show the burns on their bodies at Kutupalong refugee camp. The boys' uncle said the burns resulted from Myanmar's armed forces firing rockets at their village Reuters Bullets and burns: injured Rohingya refugees Kalabarow, 50, at Leda refugee camp, in Bangladesh. Kalabarow said her husband, daughter and son were killed when soldiers fired on her village in Maungdaw. She was hit and lay on the floor pretending to be dead for several hours before a grandson found her. During their journey to Bangladesh, a village doctor amputated her REUTERS/Jorge Silva Bullets and burns: injured Rohingya refugees Ansar Allah, 11, at Leda refugee camp in Bangladesh. Allah showed a large scar – the result of a gunshot wound. His mother Samara said: 'They sprayed us with bullets, as our house was burning' REUTERS/Jorge Silva Bullets and burns: injured Rohingya refugees Anwara Begum, 36, at Kutupalang refugee camp, near Cox's Bazar. Begum said she woke to find her home in Maungdaw township in flames REUTERS/Jorge Silva Bullets and burns: injured Rohingya refugees Abdu Rahaman, 73, at Leda refugee camp in Bangladesh. Rahaman, a merchant from Maungdaw, was ambushed while walking on a mountain path with other refugees. A machete thrown at his feet severed three toes REUTERS/Jorge Silva Bullets and burns: injured Rohingya refugees Nur Kamal, 17, described how soldiers assaulted him after they found him hiding in his home in Maungdaw. His uncle found him unconscious in a pool of blood. It took them two weeks to get to Bangladesh. Kamal said: 'We want the international community to help us obtain justice' REUTERS

Separately, the UN refugee agency, UNHCR, said it was concerned about people living just inside Myanmar at its border with Bangladesh.

The office is monitoring developments after several thousand people living in a makeshift camp “were reportedly ordered to vacate the area by the Myanmar authorities,” the agency said.

"UNHCR underscores that everyone has the right to seek asylum, just as they also have the right to return home when they deem the time and circumstances right," it said in a statement released late on Monday.

"People who have fled violence in their country must be granted safety and protection and any decision to return must be voluntary and based upon a free and informed choice."