The UN rights chief said decades of “systematic” abuses against Rohingya Muslims were largely to blame for spiralling violence in Myanmar’s Rakhine state, insisting authorities could have prevented the bloodshed. Zeid Ra’ad Al Hussein expressed alarm at the upsurge in fighting in Rakhine, an impoverished state neighbouring Bangladesh, which has been raging since Friday when Rohingya terrorists staged coordinated ambushes against Myanmar’s security forces.