The flag of the Islamist Syrian rebel group Jabhat al-Nusra flies over the main square of the city of Raqqa, east Syria May 1, 2013. The square was previously called the President Square and is now changed to Prophet Mohammed Square, according to activists. REUTERS/Hamid Khatib (SYRIA - Tags: CONFLICT POLITICS)
The flag of the Islamist Syrian rebel group Jabhat al-Nusra flies over the main square of the city of Raqqa, east Syria