State media hasn’t implied anything. I’m sure they’ll investigate. But helicopters crashing in terrible weather conditions isn’t unusual. I’d put my money on accident unless some compelling evidence is forthcoming.

It’s plausible that this was perpetrated by a foreign entity or even an internal struggle for power, and that the Iranian state knows. It is plausible that the state would still not make this information public. The state and its allies (Syria) has a history of concealing information on this scale, because publicizing this information may make the state look weak, or have the people demanding a military response, which may be unnecessary escalation.