The militants issued a statement to announce their separation from the Dar'e al-Jabal Brigade and called for the prosecution of commanders of the terrorist group.
They noted that the militant group has committed crimes in two villages by using heavy weapons against villagers.
Other sources, however, say the cooperation between Dar'e al-Jabal Brigade and terrorist al-Qaeda-linked organization of Islamic State of Iraq and the Levant is the reason of the separation.
This is while, FSA commanders are trying to distance themselves from al-Qaeda and its affiliated militant groups because some European countries have opposed to provide them with more military aids over concerns that they may fall in the hands of extremists.
The conflict in Syria started in March 2011, when pro-reform protests turned into a massive insurgency following the intervention of Western and regional states.
The unrest, which took in terrorist groups from across Europe, the Middle East and North Africa, has transpired as one of the bloodiest conflicts in recent history.
As the foreign-backed insurgency in Syria continues without an end in sight, the US government has boosted its political and military support to Takfiri extremists.