Syrian Observatory for Human Rights (SOHR) reported on Monday that a blast at a jihadist-run arms depot in Syria's northwestern Idlib region killed two fighters and a civilian.
The blast, which took place at Al-Furousiya camp near the town of Fuaa, blew the warehouse to smithereens and set fire to a nearby field.
SOHR said: "The blast destroyed a warehouse run by jihadists in which missiles and explosive materials were manufactured."
Moreover, six of the camp residents, including women and children, were injured in the blast.
It was not immediately clear what caused the explosion, but it claimed that it was most likely caused by an airstrike.
On the other hand, SOHR stated a short while ago that a massive explosion was heard in several areas across the Syrian city, followed by thick black smoke.
No further details were received until the moment.