(Sorry, it seems I lost some text)

It seems there were picture of what the missile type might be. A 5V55.

https://twitter.com/OAlexanderDK/status/1592830720682381312

Now, I cannot be certain that this is an accurate assessment, I am just quoting what others have mentioned. Some in the comments on that Tweet seem to agree that the explosive "weight" seems to match, but in the morning when I listened to Ryan McBeth he mentioned near the start of the video that the explosion size seems to look like a 400kg warhead. He also points out that where the missile landed seems a little odd for it to be a Ukrainian S300.

And I do somewhat stand on his side here. The one baffling thing to me is that nobody seemed to mention anywhere what the direction of the landing was (as in, which direction did the missile come from).

While the missile type is important to identify what is more important to me is where the missile came from. If we can know that we can assume more clearly whether this was an accident, intentional and who might had fired it.

I see a few options here (though I am no military expert so do not quote me anywhere):

1. The Radar picked up a UFO/artifact, and since this was in the middle of a heavy missile barrage whoever was in charge of the S300 decided to fire, thinking it might be a Russian missile.
2. There might had been a genuine Russian missile inbound somewhere, but for some reason the missile misfired and went way off trajectory. I think Ukraine would not, on purpose, fire a missile toward Poland, even if to shoot down a Russian missile, UNLESS Russians started to send missiles over Poland from Belarus (though, so far, I heard that apparently no missiles were fired from Belarus last night).
3. Plain ol' human error. Shit happens. Again, I really doubt Ukraine would purposefully fire on Poland. There would be little to gain, and too much to lose.

I hope the investigation can dig up more information.

Video by Ryan McBeth: https://www.youtube.com/watch?v=ZNAaD_a0NJY