( CNN ) -- Egyptian troops canvassed streets Friday after a fresh spate of violence in the volatile North African nation , hoping to prevent a repeat of the bloody , chaotic revolution of two years ago , a military spokesman said . Military forces have been deployed nationwide to protect Egyptian citizens and property , Ahmed Ali told the MENA state news organization , as reported by Ahram Online , another official news agency . The Ahram story recalled how police stations came under attack , prisons were broken into and shops were looted in the unrest of early 2011 . `` These measures are being taken to avoid a January 28 , 2011 , scenario , '' the spokesman said . Those protests and a government crackdown culminated in the ouster of longtime Egyptian President Hosni Mubarak . Friday 's move follows deadly clashes in Alexandria and elsewhere , many of them targeting Egypt 's Muslim Brotherhood . Four members of that Islamist group -- which was banned under Mubarak but has risen to power since his fall , most notably in the form of President Mohamed Morsy who has been in office for a year -- have been killed in recent days . The Alexandria office of the Brotherhood 's political arm , the Freedom and Justice Party , was attacked Friday . Health Ministry spokesman Yehya Moussa said one man was killed by a gunshot wound to the head during clashes outside party headquarters . And on Friday night , he said that a 21-year-old American had died in the Alexandria clashes . The young man 's family identified him as Andrew Driscoll Pochter , a Kenyon College student living in the Egyptian port city to teach English to 7- and 8-year-old children . Their understanding was that he 'd been witnessing the events `` as a bystander ( when he ) was stabbed by a protester . '' `` He went to Egypt because he cared profoundly about the Middle East , and he planned to live and work there in the pursuit of peace and understanding , '' his family said . `` Andrew was a wonderful young man looking for new experiences in the world and find ways to share his talents . '' State media reported that 70 were injured in the same clashes . Read more : Ready for Egypt 's 'second revolution ? ' Two people were shot dead Thursday when armed men attacked the Muslim Brotherhood officers in Zagazig , Morsy 's hometown , spokesman Gihad Haddad said . The identity of the shooters is unknown , but Haddad said witnesses heard the gunmen shouting `` down with Morsy . '' Another Muslim Brotherhood member died from injuries he suffered in clashes in Mansoura , Haddad said . `` I feel rage and the inability to act , '' he said . `` I feel there is a treasonous police force that 's allowing this to happen . '' Morsy gave a speech this week highlighting his achievements during his first year in office . But the largest opposition umbrella group said Morsy did not address his shortcomings , and issued a statement calling for snap presidential polls , a new government and constitutional amendments . Morsy 's speech `` only deepens our resolve to press our demands for early presidential elections in order to achieve the aims of the revolution , most important of which is social justice , '' the statement said . Haddad said that the Brotherhood 's policy is to never respond to attacks against it with violence . However , he seemed to suggest that the Brotherhood 's leaders may not be able to stop reprisal attacks . `` I do n't think organization will matter that much . I am concerned because , if anything , these killings are infuriating the youth . All the martyrs are Brotherhood youths , '' he said . He said the Brotherhood would go ahead with planned demonstrations Friday in Cairo followed by an indefinite sit-in . If the sit-in extends to Sunday , it would coincide with mass demonstrations planned by opposition factions in front of the presidential palace . Governments around the world are paying attention -- at the least , to make sure that their own workers and citizens are safe . About 200 U.S. Marines in Sigonella , Italy , and Moron , Spain , have been put on alert as a precaution , according to two officials in President Barack Obama 's administration . U.S. Marines told to be ready to go to Egypt . The units have several V-22 tilt-rotor aircraft that could carry personnel and weapons to protect the U.S. Embassy and American government personnel and citizens if violence breaks out targeting Americans . They 've been told to be ready to be airborne within 60 minutes of getting orders to deploy , the officials said . The United States has approved the departure of embassy and consulate employees and their dependents because of the brewing unrest , a senior State Department official said . Nonessential employees and their relatives can get help leaving , if they choose to do so . CNN 's Elise Labott and Barbara Starr contributed to this report .
NEW : An American teaching English was a bystander when he was stabbed , family says . Egyptian troops deploy nationwide to curb unrest , a military spokesman says . Several members of the Muslim Brotherhood have been killed nationwide recently . Comment: