US ambassador to Libya and three staff killed at consulate in Benghazi in response to video critical of Islam; experts say it is tragic diplomat who had done so much to free Benghazi from dictator would be killed by residents; US urges "cooler heads to prevail" in dispute over South China Sea islands; Occupy Hong Kong protesters removed after 11 months; 300 killed in Pakistan factory fires; South African mining protests spread to platinum mine; and more