A video appearing to show Syrian rebels murdering soldiers or pro-government militiamen could be evidence of a war crime, the UN has said.
The footage shows gunmen beating and shooting a group of prisoners who were cowering on the floor.
It has been alleged that Islamist militants carried out the attack after seizing army checkpoints on Thursday.
Unconfirmed reports say troops have now quit all bases near the strategic northern town of Saraqeb.
The town lies near the main roads linking Aleppo to Damascus and the coastal city of Latakia.
The army, meanwhile, continued its air strikes across Syria on Thursday.
In all, more than 150 people reportedly died in fighting, said the Syrian Observatory for Human Rights (SOHR), a UK-based activist group.
The SOHR said that among the victims were more than 70 government soldiers, 43 civilians and 38 rebels.
The claim has not been independently verified.
In other developments:
The Arab League says Russian Foreign Minister Sergei Lavrov, international peace envoy Lakhdar Brahimi and Arab League Secretary General Nabil el-Araby will meet in Cairo on Sunday to discuss the Syrian crisis.
Indonesian President Susilo Bambang Yudhoyono, on a visit to the UK, again calls for armed UN intervention in Syria.
Syrian rebels kill a Kurdish woman militia leader in the northern city of Aleppo, the SOHR said, highlighting tensions between rebels and Kurds.
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