Thank goodness!
It's clearly some sort of expanding smoke plume given the time and dissipation rate.
I have copied the gifs - I doubt they'll be available later.
I just dont like it. At that range they could easily have been reached by a ground based transmitter of some sort. I'm biting my lip trying to keep from reading too much into it until more is known.
It is a tragedy either way.
SDAI-Tech1