Obama has called for Americans not to be disheartened by anti-America violence, as six protesters have died in protests against an anti-Islam film.
Protesters furious at an anti-Islam film have clashed with police near the US embassy in Cairo before a protest called by the Muslim Brotherhood.
The search for those behind the film implicated in violence in Egypt and Libya has led to a California Coptic Christian convicted of financial crimes.
YouTube says it will not remove a film mocking the Prophet Muhammad entirely from the site, but it has blocked access to the clip in Egypt and Libya.