The SANA agency reported that it was a landmine left behind by Daesh in al-Azib valley in the Salamyieh countryside.
Whilst not uncommon Syria, the sheer magnitude of the blast, along with the large number of victims, is unprecedented.
A day earlier, the SANA agency reported that the Syrian Army had destroyed rocket launching pads for terrorist groups in Latamina, Kafar Zeita, al-Habbeet, and Mourek in the countryside of Hama and Idlib.
On Feb. 16, armed groups from the Idilb de-escalation zone attacked Tall-Salhab and Kibriya in Hama province as well as Hara [a settlement] in Aleppo province and western districts in the city of Aleppo, the Russian Defence Ministry's Centre for Reconciliation reported.
On Feb. 8th, seven civilians were martyred and others were injured when a landmine planted earlier by Daesh armed groups - before they were eradicated, went off in the surroundings of Rasm Ahmar village in Salamyiah eastern countryside, Hama province.
An estimated 300 ISIS militants are besieged in the village of Baghouz, hemmed in by the Euphrates River and the US-backed Syrian Democratic Forces, a Kurdish-led militia spearheading the fight against ISIS following an intense push since September, reports Al-Arabiya.