BEIRUT - An agreed-on pullout of a few thousand Syrian militants, including ISIS fighters, and their families from a neighborhood on the southern edge of Damascus has been put on hold, according to an official.
The Yarmouk neighborhood is home to a Palestinian refugee camp and has been hotly contested and fought-over in the Syrian conflict. ISIS seized large parts of Yarmouk earlier this year.
Palestinian official in Damascus Anwar Abdulhadi told The Associated Press on Saturday that the withdrawal of the mainly ISIS militants from Yarmouk is being delayed for "logistical reasons."
Other unconfirmed reports say the assassination of top rebel commander Zahran Allouch near Damascus on Friday night has torpedoed the deal to evacuate the fighters.
Allouch, the head of the Army of Islam group, was killed in an airstrike that targeted the group's headquarters during a meeting on Friday. He was instantly killed along with other commanders from the ultraconservative Ahrar al-Sham and the Faylaq al-Rahman groups.
His assassination - a month before peace talks are scheduled to begin between the Syrian government and opposition rebel groups - is a blow to insurgents fighting to topple President Bashar Assad and a boost to government forces who have been bolstered by the Russian military intervention in Syria in the past few months.
Syrian government forces have been on the offensive in several parts of the country since Russia began its military campaign in late September to shore up Assad's forces.
The Army of Islam took part earlier this month in an opposition meeting held in Saudi Arabia to agree on an opposition delegation that would negotiate with Assad's government representatives in peace talks planned for late January in Geneva. The Syrian government describes the group as "terrorists" and has said it will not negotiate with such factions.
The Syrian army claimed responsibility for the airstrike that killed Allouch, although many among the opposition blamed Russia.
"The martyrdom of Sheikh Zahran Allouch should be a turning point in the history of the revolution and rebel groups should realize they are facing a war of extermination by (Russian President Vladimir) Putin's regime," said Labib Nahhas, a senior member of the Ahrar al-Sham group.
"The next stage will witness the liquidation of those leaders who began the uprising," wrote Abu Hassan al-Muhajer, another senior member of the group on Twitter.
Other insurgent groups, including the al-Qaeda branch in Syria, the Nusra Front, lamented his killing.
The Army of Islam group swiftly appointed Essam al-Buwaydhani, a field commander known as Abu Hammam, as the new leader of the group, replacing Allouch.
In a video posted on the Internet late Thursday, a spokesman for the Army of Islam said Allouch's killing "will only increase our fight" against Assad's government and the Islamic State group.
"We are moving forth on the path, and we do not change or alter," the unidentified speaker said, reading from a statement.
In a statement, the Nusra Front said Allouch died after years of "sacrifice" and wished his successor luck.
Allouch, who was in his mid-40s, was widely known to be supported by Saudi Arabia and Turkey. He was one of the most powerful rebel commanders with thousands of fighters controlling large parts of the eastern Damascus suburbs of Eastern Ghouta and Douma. In addition to fighting government forces, the Army of Islam faction fought pitched battles against its rival, the Islamic State group near Damascus.
A former prisoner who was released in a general amnesty after the uprising against Assad began in March 2011, Allouch joined the armed opposition and formed the Army of Islam - which soon became one of the most organized rebel factions in Syria.
Critics accused him of sectarian politics and brutal tactics similar to that of the Islamic State group.
He is blamed by other opposition groups for the December 2013 disappearance of four prominent activists, including human rights activist and lawyer Razan Zaytouni. He has denied holding them, although they were abducted from an area under Army of Islam control.
Earlier this year, after government airstrikes on the suburbs of Damascus killed dozens, Allouch's fighters forced some Alawites whom his group was holding into cages that were then displayed in public areas and markets, using them as human shields to try to prevent further airstrikes. Alawites are a Shiite offshoot to which Assad's family also belongs.
The large metal cages with men and women inside were then put on pick-up trucks that drove around Damascus suburbs.