Ahrar al-Sham said in an announcement on Thursday that overnight strikes likewise decimated one of its bases close to the outskirt.
US-headed airstrikes likewise struck the al-Qaeda-joined al-Nusra Front for just the second time since the coalition was structured in September.
A few activists are said to have been executed in the assaults did in the Syrian territories of Idlib and Aleppo.
Since late September, the US and some of its Arab associates have been doing airstrikes against ISIL inside Syria without any approval from Damascus or an UN order.
US warplanes have been directing airstrikes against ISIL in Iraq since ahead of schedule August. Some Western states have likewise taken part in a percentage of the strikes in Iraq.
The US-headed coalition has done little to stop the ISIL's advances in parts of Syria and in western Iraq.
A few examiners have scrutinized the flying military fight in Syria, saying the strikes are intended to wreck the Arab nation's base.
Alan Sabrosky, a US Marine Corps veteran, has said that the United States' airstrikes in Syria regularly target aggressors with "no military worth" and really go for the nation's foundation.