NEW : An Interior Ministry spokesman reports 145 arrests and 53 policemen injured . The clashes began after police tried to disperse a protest by the Muslim Brotherhood in Cairo on Friday night. But as it has since Tuesday , unrest continued outside the American embassy as riot police clashed sporadically with protesters . : 1 protester , an ex-convict , is killed by birdshot , the Interior Ministry adds . There have been scores of injuries over the last four days near the U.S. embassy . One analyst said Obama put Morsy `` on notice '' to tamp down violence .
NEW : An Interior Ministry spokesman reports 145 arrests and 53 policemen injured . The clashes began after police tried to disperse a protest by the Muslim Brotherhood in Cairo on Friday night. : 1 protester , an ex-convict , is killed by birdshot , the Interior Ministry adds . There have been scores of injuries over the last four days near the U.S. embassy . One analyst said Obama put Morsy `` on notice '' to tamp down violence .