UN chief Ban Ki-moon has called on the Security Council to act immediately to stop ethnic violence in Central African Republic, citing widespread attacks on Muslims there."We must live up to the promises made around this table to act swiftly and robustly in the face of such bloodshed," Ban told the Security Council on Friday."We cannot claim to care about mass atrocity crimes and then shrink from what it means to actually prevent them."He warned Friday that in Central African Republic "the very fabric of society, woven over generations, is being ripped apart."This came as thousands of Muslims who tried to flee the violence in the capital of CAR were turned back by peacekeepers as crowds of angry Christians shouted "we’re going to kill you all."