Looks like the door is open. And the fuselage looks intact, so hopefully the crew got out.
Lots of dark smoke, so something other than fuel is burning.
New video
Moment Amazon cargo plane overran runway at Miami International Airport, killing 5 people
https://rumble.com/v7f6ape-moment-amazon-cargo-plane-overran-runway-at-miami-international-airport-kil.html