ISIS claims it shot down a Syrian air force jet east of Damascus on Friday and captured the pilot, according to Amaq, the media agency affiliated with the terrorist group.
The claim appeared to be at least partially corroborated by the London-based Syrian Observatory for Human Rights, which is opposed to both ISIS and the Syrian regime.
The Observatory said a Syrian warplane had crashed in Dakwa, southeasat of Damascus. But it said it had no information on whether the crash was due to an attack or a technical failure, nor on the fate of the crew.
ISIS published a video claiming to show the flaming wreckage of the jet, with what appears to be a Syrian flag painted on the wing. CNN cannot confirm the authenticity of the video.
The terrorist group also published the purported name of the pilot, and said he was born in the city of Hama.
Syrian media outlets have reported neither the downing of the jet nor the capture of the pilot.