ANKARA - Nine civilians were killed in overnight Turkish bombardment of a jihadist-held town in northern Syria, a monitor said on Friday, but Ankara said the shelling killed 13 "terrorists".
Three women were among those killed in the artillery fire on Al-Bab, which Turkish-backed Syrian rebels have been fighting to take from the Islamic State group, the Syrian Observatory for Human Rights said.
"In the past 48 hours, Turkish air strikes and shelling have killed 45 civilians, including 18 children and 14 women," Observatory head Rami Abdel Rahman said.
Turkey's state-run Anadolu news agency said the army had hit dozens of IS positions, seven of them from the air.
"In total, 13 IS terrorists were killed," Anadolu reported.
Ankara began military operations in Syria in August last year, targeting Kurdish fighters as well as IS, but says it is doing its utmost to avoid civilian casualties.
Al-Bab is IS's last stronghold in Aleppo province and has come under fierce attack in recent months by Turkish forces and allied Syrian rebels.
They entered the town last the weekend and are now engaged in "clean-up" operations, Turkish Defence Minister Fikri Isik said on Thursday.
The Observatory, however, said Turkish forces had made little progress since entering the town from the west, and rebels said IS was putting up fierce resistance.
Field commander Abu Jaafar said his forces had been able to overrun part of the town early Thursday, but were then ambushed by IS.
At least one jihadist suicide attacker wounded several rebels and seriously damaged their equipment, Abu Jaafar said.
"Daesh seeks to install itself in civilian and public buildings and use civilians as human shields," rebel spokesman Mahmud Hadi said on Friday.
"They use suicide attacks and they move about through basements and tunnels... they infiltrate in between civilians fleeing the military operations to try and penetrate behind the lines of the rebel factions."
Dozens of civilians have been fleeing Al-Bab on a daily basis, according to the Observatory, leaving newly liberated areas as well as escaping territory still under IS control.
From outside the town on Friday, a line of fleeing residents could be seen crossing a field to escape the fighting, as gunshots sounded in the distance.
On a road leading to the rebel-held town of Azaz, several fleeing residents had piled their belongings into carts on the back of motorbikes and were driving away.
One man driving a truck told a rebel at a checkpoint that IS fighters had fired at the fleeing civilians.
In Azaz, local authorities welcomed arrivals, some of whom were continuing on to rebel-held territory further west, in Idlib province.