Behind the Arab Spring and the violence in countries like Syria lies another hidden war. On one side, the Shiites, led by Iran. On the other, the Sunnis, under the protection of Saudi Arabia and Qatar.
Two rival branches of Islam, competing to impose their religious and political supremacy on the Arab-Muslim world. In Aleppo and Damascus, jihadists supported by Saudi Arabia and Qatar are engaged in fierce fighting with pro-Assad forces financed and defended by Iran. From Syria to Iraq via Gaza and Lebanon, we investigate the sectarian violence threatening to engulf the Middle East.