The rights group also said the backlash against Muslim civilians was foreseeable -- and should have been prevented . ` NEW : Head of the refugee agency ' deeply distressed ' Amnesty International says they have failed to stop ethnic cleansing . Violence has led to a ` ` Muslim exodus of historic proportions , '' says the rights group . Christian and Muslim militia groups are warring in the Central African Republic .
NEW : Head of the refugee agency ' deeply distressed ' Amnesty International says they have failed to stop ethnic cleansing . Violence has led to a ` ` Muslim exodus of historic proportions , '' says the rights group . Christian and Muslim militia groups are warring in the Central African Republic .