Where are you seeing these reports?
Syrian state-owned media is claiming that Syrian air-defenses intercepted eight missiles that were targeting T4 airbase.
So take it with a grain of salt.
From Twitter (search Syria), then go out to the linked news pages, such as BBC and others. Also had RSBN.tv on for a bit they were trying to live-blog info. Turned that off when it became a bit irritating. Lots of speculation. None of the videos are conclusive and the audio such that I couldn’t say missile, rocket, or jet engine. Definitely not prop, though. Anyway, splitting my time between work and listen/catching glances at things.