Very early but it looks like pilot error. They landed short and hit the rock breakwall which broke off the tail and left a debris trail across the overrun area. Maybe a high angle of attack as if they realized to late and tried to go around.
The good news is door 5L and 5R are both open and intact. The rear pressure bulkhead is visible and broken but that means the break happened behind the seating area including the waitresses. Unless they were killed by G forces there shouldn't be many fatalities.
For LTS to chew on:
CNN has a witness that says the plane cartwheeled across the ground.
Another on CNN says the wings broke off.
A third says the wheels slipped and the plane slid backwards towards the water.
Clearly none of those things happened, yet they still saw what they saw.
![Rolling Eyes :meds:](./images/smilies/icon_rolleyes.gif)