The Islamic State of Iraq and the Levant (ISIL) granted the Free Syrian Army (FSA) 48 hours to disarm, indicating the wide split among the terrorist groups in Syria.
ISIL has set the 2-day deadline for the Free Syrian Army to yield as the infighting among the different militant groups intensified, Press TV quoted media reports.
The ultimatum was enforced at 8:00 p.m. local time (23:00 GMT) on Thursday.
Clashes among Takfiri militants have increased in recent months.
According to a study conducted by the British institute for defense, IHS Jane's, in September and published by the UK Daily Telegraph last week, nearly half of mercenaries in Syria are hard-line militants.
The study showed that the number of insurgents fighting against the Syrian army is estimated at about 100 thousand gunmen distributed to about a thousand armed band, who came from 83 countries, including all Arab countries except Djibouti.