Jabhat Fateh al Sham (Al Nusra Front) released a statement expelling Jund al Aqsa group from its ranks.

It was caused by tensions between rebel groups in Idlib and Hama countrysides.
The Emir of Jund al Aqsa had pledged allegiance to JFS several months ago, but now JFS disowned Jund al Aqsa’s allegiance to the group due to the infighting with Ahrar al-Sham. It decided to expel Aqsa citing their lack of commitment to the agreement hoping to avoid a bloodbath that could take rebel-dominated Idlib by storm.