Egypt's army chief Abdel-Fattah el-Sissi, who is also the defense minister, warned Tuesday of "the collapse of the state" if the political turbulence sweeping the nation for six days continues. Some 60 people have been killed in protests in Egyptian towns against Muslim Brotherhood rule and President Mohamed Morsi since last Friday. Monday night, protesters defied the night curfew imposed by the president in three cities.  El-Sissi's warning at the military academy Tuesday was posted on the armed forces' official Facebook page. The army is deployed in Port Said and Suez and authorized to arrest civilians.