How much can you trust government agencies in times like these? With so many competing intelligence agencies, quite possibly sitting on the brink of WWIII, I don't think it's outlandish for an official source to lie, intentionally or not.
The amount of trust put into any conclusion at this point should be minimal, and whilst I understand and partly share the lack of trust in embassy statements, I posted this to counter the blind "looks like it was shot down, someone on twitter said so" conclusion.
They might not even be lying: would it be classified as a "terrorist attack" if it's a mistake by the Iranians? A "rocket attack" wouldn't hit an airplane, you need guided missiles for that.
Then why even talk about anything at that point if you were not there yourself.