0751 GMT August 22, 2019
The source said it was "likely that Al-Nusra Front shot down the plane and took the pilot," adding that the plane had been hit by heavy machinegun fire, AFP reported.
The Syrian Observatory for Human Rights said Al-Nusra downed the plane, which it said was likely being flown by a Syrian Air Force pilot.
The Al-Qaeda affiliate is not party to the cease-fire between the government and the opposition brokered by the United States and Russia that has been in place since February 27.
In video footage circulated on social media purporting to show the scene where the plane came down, a dozen men crowd around a man lying in the dirt.
Some of them cry: "He's Syrian, he's Syrian!" and others yell: "Get his weapons off him!"
Last month, terrorists shot down a Syrian warplane over the village of Kafr Nabuda in the central province of Hama.