The Russian Air Force "had never conducted strikes" in that portion of Syria before, the official said. Su-34s are modern Russian fighter-bombers comparable to a U.S. Air Force F-15. Russian Su-34 "Fullbacks" conducted the airstrikes, according to the official who said it was most likely a flight of two, the typical attack profile for the Russian Air Force in Syria. Some of the U.S.-backed Syrian rebels were part of the Pentagon's "train and equip" program, and others were CIA-trained, the official said. The attack left some Syrian rebels dead and others wounded, the official said, but he did not have any specific numbers immediately available.

Source: Fox News June 17, 2016 10:22 UTC