The Syrian Army has found another weapons-making workshop, belonging to ISIS (Daesh) terrorists following government forces' mopping up operations in Deir Ezzur province.

Local sources confirmed on Thursday that the army uncovered a large weapons factory that was used by ISIS (Daesh) terrorists to produce mortar shells, IEDs and other types of explosives.

According to local sources , the weapons factory was discovered by the Syrian army in the town of Mahkan, north of ISIS's former stronghold of al-Mayadeen.

In a relevant development last week, the army found a mass grave in the northeastern province of Deir Ezzur that contained the remains of dozens of civilians and military men executed by  ISIS (Daesh) Takfiri terrorists.

The army forces discovered the mass grave in Deir Ezzur city's central garden that contains nearly 150 civilians and military men during purging operations on Thursday.

Local sources said the victims were executed by ISIS terrorists  during its rule over the region, adding that signs of torture were also evident on the bodies that had been buried there.