Among those killed was the armed group’s leader Muhammad al-Qairi, also known as Abu Hamza al-Naimi, as well as three other leaders, local sources told Al Jazeera.
No group has claimed responsibility for the bombing.
“Unfortunately, civilians who were near by were among those killed,” said Abu Omar al-Jolani, a Quneitra-based media activist who was present at the time of the blast.
In addition to a “metre-deep hole in the street”, the explosion destroyed the SRF’s finance office and badly damaged several nearby residential buildings, he added.
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