Fourteen fighters killed in north Syria attack by Kurdish group Afrin Liberation Forces
The Kurdish Afrin Liberation Forces took advantage of factional fighting that broke out after midnight on the outskirts of Al-Bab in Aleppo province, the Syrian Observatory for Human Rights said.
With artillery support, the Kurdish group infiltrated the area, leaving "at least 14 dead" and others wounded in the attack, all pro-Turkish fighters, Observatory chief Rami Abdel Rahman said.
The groups had been fighting over "control and influence" when the ambush happened, he said.
The factional leader in the rebel-held area confirmed the death toll but told AFP the fighters were from a formation that had defected from pro-Turkish groups.
The Afrin Liberation Forces are made up of Kurdish fighters who were forced out of northwest Syria's Afrin area in a Turkish offensive several years ago, and are now mainly present in northern Aleppo province.
Turkey has launched successive military offensives in Syria, most of them targeting Kurdish militants that Ankara links to the Kurdistan Workers' Party (PKK), which has waged a decades-long insurgency against the Turkish state.
Its troops and their Syrian proxies hold swathes of the border, and Turkish President Recep Tayyip Erdogan has long sought to establish a "safe zone" 30 kilometres (20 miles) deep the whole length of the frontier.
In the northeastern province of Hasakah, the Kurdish-led internal security forces said two of its members were killed in a Turkish drone strike Sunday.
The Asayish forces said its two members were killed when the Turkish drone struck a vehicle carrying its personnel on a road linking the cities of Qamishli and Amuda.
They claimed that eight civilians who tried to come to the aid of those in the vehicle were injured when the drone struck again.
Syria's war began after the government repressed peaceful protests in 2011 and escalated into a deadly conflict that pulled in jihadists and foreign powers.
The war has killed more than 500,000 people, displaced millions and battered the country's infrastructure and industry.
A 2019 Russian-brokered agreement saw Syrian government forces deployed along parts of the northern border area in exchange for Turkey halting an earlier offensive.