Tun Khin, from the Burmese Rohingya Organisation UK, says Rohingyas are suffering "mass atrocities" perpetrated by security forces in the northern part of Rakhine state.
A counter-insurgency campaign was launched after nine border policemen near Maungdaw were killed in a militant attack in early October, but the Rohingya say they are being targeted indiscriminately.
Foreign medias cannot visit the locked-down area to verify the claims and the Myanmar government has vociferously denied alleged abuses.
UN officials have told the British Broadcasting that the Rohingya are being collectively punished for militant attacks, with the ultimate goal being ethnic cleansing.
