BEIRUT/AMMAN (REUTERS) - A bomb blast claimed by the Islamic State in Iraq and Syria (ISIS) terror group at a Syria-Turkey border crossing killed at least 25 people, most of them foreign-backed Syrian rebels, and wounded dozens more on Thursday (Oct 6), witnesses said.
The Britain-based Syrian Observatory for Human Rights monitoring group put the death toll at least 29.
The attack targeted rebels from factions which have been battling the terrorist group with Turkish military support along another stretch of border further to the north-east, the witnesses and the Observatory said.
It took place on the Syrian side of the Atmeh crossing, west of Aleppo. A photo sent by a witness in the area, purportedly of its aftermath, showed the bloodied corpses lying on the ground.
ISIS claimed the attack in an online statement.
The witness said most of the rebels were from the Failaq al-Sham group, which has been fighting alongside other Turkish-backed factions in Ankara's offensive, dubbed "Euphrates Shield".
That operation, taking place along the border north-east of Aleppo, has also targeted Kurdish militants.
The rebels use the Atmeh crossing to move between Idlib province, through Turkey, to the areas where anti-ISIS operations are taking place, the Observatory said.
Residents said they also use it to evacuate wounded fighters.
Among the dead from the Atmeh blast were the head of the top civil judicial body in rebel-held eastern Aleppo, Mr Sheikh Khaled al-Sayyed, and a judge who worked with him, a witness and a rebel official said.
Syria's Idlib province, where Atmeh is located, is a bastion of the Turkey-backed opposition to President Bashar al-Assad's rule. A multi-sided civil war has raged in Syria for more than five years.
ISIS is fighting against all sides, including the Syrian government, foreign-backed rebels and other US-backed fighters.
Aleppo, further to the east, has been divided for years between government- and rebel-held areas. The opposition have set up their own administrative bodies in the east.
Government forces have encircled eastern Aleppo in recent weeks in a battle separate to that with ISIS, and seek to completely recapture the city, Syria's largest before the war.
