From the U. S. State Department:

The U.S. Department of State alerts U.S. citizens traveling to or living in Egypt to the continuing possibility of sporadic unrest. Egypt will hold the first round of presidential elections May 23-24, 2012, and if needed, a second round June 16-17, 2012. The new president is scheduled to take office no later than June 30, 2012. Political rallies and demonstrations are likely to occur in the period leading up to and following the elections and during the drafting of a new constitution. In the past year, demonstrations have degenerated on occasion into violent clashes between police and protesters, in some instances resulting in deaths, injuries, and extensive property damage. U.S. citizens are urged to remain alert to local security developments and to be vigilant regarding their personal security. The security situation in most tourist centers, including Luxor, Aswan, and the Red Sea Resorts such as Sharm el Sheikh, continues to be calm. ...

The U.S. Department of State strongly urges U.S. citizens to avoid all demonstrations in Egypt, as even peaceful ones can quickly become violent and a foreigner could become a target of harassment or worse. Several U.S. citizens have been arrested during demonstrations. Should security forces block off the area around the U.S. Embassy during demonstrations, U.S. citizens should not attempt to come to the U.S. Embassy during that time. U.S. citizens are urged to remain alert to local security developments and to carry identification and, if moving about alone, a cell phone or other means of communication that works in Egypt. ...

U.S. State Department Alert