about 60 U.S. personnel , including ambassador , are killed in U.S. , the U.S. says . Angry protesters attack U.S. diplomatic compounds in U.S. and Libya . Romney says the Libya is working to protect its citizens worldwide .
Four U.S. personnel , including ambassador , are killed in Libya , the U.S. says . Angry protesters attack U.S. diplomatic compounds in Egypt and Libya . Obama says the U.S. is working to protect its citizens worldwide .