ISTANBUL – The Syrian ambassador to Iraq has defected and is on his way to Turkey, the most senior diplomat to abandon President Bashar Assad during the 16-month-old uprising, a Syrian opposition figure said Wednesday.

Nawaf Fares, a former provincial governor, would be the second prominent Syrian to break with the regime in less than a week.

Brig. Gen. Manaf Tlass, an Assad confidant and son of a former defense minister, fled Syria last week, buoying Western powers and anti-regime activists, who expressed hope that other high-ranking defections would follow.