Initial reports were mixed between it being a gas explosion and drones carrying bombs. There's a few videos This one shows presumably what was on state TV, shows the initial reaction, then the reaction from the soldiers in the parade. Source: https://www.youtube.com/watch?v=4X2dmYaKyWE This one shows the reaction of the President and his security detail, and those around him Source: https://www.youtube.com/watch?v=-xDapjigVAI Both show people looking up, which seems to tally with the drone account Here's a shot of an apartment, supposedly the site of one explosion - which understandably would look like a gas explosion if that's all you saw. Multiple ways in which this could be interpreted as a "False flag". Story unfolding.