Myanmar's Rohingya ethnic minority, victims of a brutal campaign of mass atrocities and persecution by the country's military in 2016 and 2017, is again facing a wave of deadly violence that raises the "specter of ethnic cleansing." This time, however, the perpetrators are said to be the Arakan Army (AA), one of several ethnic groups fighting the nation's ruling junta, as well as Myanmar's security forces, according to survivors and human rights groups.