Ankara Turkish officials Friday said that two Syrian generals, a colonel and two sergeants have defected from the Syrian army and crossed into Turkey, a day after Syria's deputy oil minister also deserted President Bashar Al Assad's regime.

The defections come amid reports of Syrian army assaults on the northern Syrian province of Idlib, which borders Turkey, and as UN humanitarian chief Valerie Amos toured Syrian refugee camps along the Turkish-Syrian border before talks with Turkish Foreign Minister Ahmet Davutoglu.

The officers' defections are significant because most army defectors so far have been low-level conscripts.

Al Assad's regime has suffered a steady stream of low-level army defectors, who have joined a group of dissidents known as the Free Syrian Army, now numbering in the thousands.

Sinking ship

On Thursday, Syria's deputy oil minister became the highest-ranking civilian official to join the opposition and urged his countrymen to "abandon this sinking ship" as the nation spirals toward civil war. Abdo Hussam Al Deen, 58, announced in a video that he has defected.