(better know by its former name, al-Nusra...formally Jabhat an-Nusrah li-Ahli al-Sham (Support Front for the People of the Levant), also known as al-Qaeda in the Levant. They aim to establish a pan-Arab caliphate. Not the same one as the Islamic State, though .. ...
Front) forces evacuating from Damascus’ East Ghouta region took with them tens of rival bully boyz of the Jaish al-Islam
...Liwa al-Islam (Brigade of Islam) was established by Zahran Alloush, the son of Saudi-based religious scholar Abdullah Mohammed Alloush, after Syrian authorities released him from prison in mid-2011 where he had been serving time for his Salafist activism. The group claimed responsibility for carrying out the July 2012 Damascus bombing that killed Defense Minister Dawoud Rajiha, Deputy Defense Minister Asef Shawkat, and Assistant Vice President Hassan Turkmani. It was a driving force behind actions in the Damascus region. It cooperated and conducted joint operations with al-Nusra. In Sptember 2013 Saudi Arabia engineered Liwa al-Islam's merger with fifty other more or less Salafist groups as a counterweight to al-Nusra, which the Learned Elders of Islam considered was growing too powereful...
faction have now been confirmed.
According to reports, the hostages ‐ a total of 21 say sources ‐ had been captured Ha’yat Tahrir al-Sham during previous infighting across East Ghouta.
During the evacuation, Ha’yat Tahrir al-Sham managed to sneak the hostages on buses bound for rebel-held areas of northern Syria without being detected at first. Later when it became apparent that the al-Qaeda affiliate had Jaish al-Islam prisoners in its possession, violence involving the use of belt bombs was threatened.
The buses carrying the myrmidon prisoners have since arrived at Qalaat al-Mudiq after which Ha’yat Tahrir al-Sham loaded them into their own trucks and disappeared to an unknown location in Idlib province (presumably).