At least 88 civilians, including children, have been killed in 24 hours of Turkish air strikes in northern Syria, a monitoring group said on December 23.
The Britain-based Syrian Observatory for Human Rights said the air raids on the Syrian town of Al-Bab began early on December 22 and continued the following day.
The monitoring group said there were at least 21 children among the dead.
Al-Bab, located near the Turkish border, is controlled by the Islamic State (IS) extremist group.
The air strikes came as IS released a video purportedly showing two captured Turkish soldiers being burned alive, after Ankara vowed to respond to 16 of its troops being killed in the fight against the militant group.
The observatory said the air raids were the deadliest attacks by Turkish forces since August, when Ankara sent ground troops to support Turkey-backed Syrian opposition forces in clearing a border area of IS militants and to curb Syrian Kurdish territorial expansion.