In the final days leading to his ouster, Syrian President Bashar al-Assad complained to Iran's foreign minister that Turkey was actively supporting Sunni rebels in their offensive to topple him, two Iranian officials told Reuters this week.

The leaders — from Egypt, Jordan, Saudi Arabia and the United Arab Emirates — are worried that Assad’s ouster could stir unrest at home, say analysts, officials and diplomats. They are also concerned that Syria could plunge into chaos,