MYANMAR security forces killed hundreds of men, women and children during a systematic campaign to expel Rohingya Muslims, Amnesty International has said in a new report.

More than 580,000 refugees have arrived in Bangladesh since August 25, when Myanmar security forces began a scorched-earth campaign against Rohingya villages.

Myanmar’s government has said it was responding to attacks by Muslim insurgents, but the UN and others have said the response was disproportionate.

Based on interviews with more than 120 fleeing Rohingya, Amnesty said at least hundreds of people were killed by security forces who surrounded villages, shot fleeing inhabitants and set buildings alight, burning to death the elderly, sick and disabled who were unable to flee. In some villages, women and girls were raped or subjected to other sexual violence, according to the report.

The witnesses repeatedly described an insignia on their attackers’ uniforms that matched one worn by troops from Myanmar’s Western Command. The 33rd Light Infantry Division and border police, who wear a distinctive blue uniform, were also frequently involved in attacks, along with Buddhist vigilante mobs, witnesses said.