Turkish bombardment of an Islamic State group-held town in Syria has killed 24 civilians, a monitor said Thursday, but Turkey's army said the operation had only killed "terrorists."

The Syrian Observatory for Human Rights said the dead in air strikes and shelling on the town of Al-Bab in the last 24 hours included 11 children.

Turkey's army, quoted by the state-run Anadolu news agency said it had killed 15 "terrorists" in air strikes, artillery fire and clashes.