Kurdish forces in Syria may have surrounded ISIL in its stronghold of Raqqa, but a battle of ideas is still being waged inside and outside the country.

Filmmaker Matthew Heineman, director of City of Ghosts, hopes his film sheds light on the ideological conflict between the armed group and citizens.

Al Jazeera's Kristen Saloomey spoke to Heineman and Abdel Azizi Alhamza, a Syrian promoting the film, in New York.

US & Canada, Arts & Culture