[sjmjax]

I don't know if it was a missle or aircraft contrail. I wasn't there to see it in person and video can be misleading depending on time, distance and perspective.

However if it was a missle, the Government knows it and almost certainly who launched it.

[massgopguy]

Whoever launched it probably shelled an island off of South Korea last week.

[MontaniSemperLiberi]

Near the end of the video the bright exhaust can be seen. Note how it changes color.

Solid rocket missile.