Jihadist militants from Islamic State (IS) appear to have executed "dozens" of Syrian army soldiers, activists say.
The Syrian Observatory for Human Rights said the soldiers were captured while attempting to flee to Hama province after IS stormed the Tabqa airbase.
Twitter accounts belonging to jihadists had boasted about 200 deaths, it added.
On Wednesday, photos and a video were posted online appearing to show more than 100 men in their underwear being marched through the desert at gunpoint.
In the video, militants shout "Islamic State" and "There is no going back".
In images published earlier this week, IS fighters wearing balaclavas could be seen shooting dead at least seven kneeling men at the airbase.