According to this report it was 11 commanders from Ahrar (including not only Aboud, but their military wing leader Abu Abdel Malik too), and up to 35 other leaders and commanders from the Islamic Front.

The source is citing a 'suicide bombing' instead of a car attack.

Meanwhile, and as indicated by plenty of other reports in recent days, the ISIS is going for Dayr az-Zawr as its next target. The regime is already claiming 78 Jihadists as KIA there in the last few days.