Today, the Army of Islam and allied militant groups in Syria mourned the killing of Zahran Alloush, while government supporters and the Islamic State group cheered his death - a reflection of his role in fighting both sides in the Syrian civil war.
Allouch was killed in airstrikes that targeted the group's headquarters during a meeting yesterday.
The Syrian army claimed responsibility for the airstrike that killed Allouch, although many among the opposition blamed Russia, which has been bombing IS targets and other insurgent groups since late September.
Allouch was a controversial figure in the war and an authoritative rebel leader who commanded thousands of fighters on the doorstep of Damascus, the seat of Assad's power.
His death may have contributed - at least partially - to a delay in an agreed-on pullout of thousands of militants and their families from neighbourhoods on the southern edge of Damascus.
A Palestinian official in Damascus, Anwar Abdulhadi, told The Associated Press that the withdrawal is being delayed for "logistical reasons."
But Lebanon's Hezbollah-run TV station Al Manar said that Allouch was a key figure in arranging the rare deal, and that his assassination has delayed its implementation.
The report could not be immediately confirmed by the AP.
The Army of Islam took part earlier this month in an opposition meeting held in Saudi Arabia during which it agreed to take part in political talks seeking to end the five-year-old conflict scheduled for late January in Geneva.
