To the best of my knowledge, the NTSB has not released any preliminary assignment of blame. They spend years on these sort of things, checking every detail, dot

To the best of my knowledge, the NTSB has not released any preliminary assignment of blame. They spend years on these sort of things, checking every detail, dotting every 'i' and crossing every 't' before they make those determinations, as they carry a huge amount of weight. (And I do think this is the appropriate thing to do). That being said, from all the information that is publicly available, the consensus of everyone else seems to be that it is human error, as there have been no reports of any of the plane's systems not performing normally given the inputs of the crew. Now, that being said, we shouldn't say "Pilot Error" and move on, but should instead look for any systematic flaws that allowed the pilot error to take place. This might be the result of training issues, or the airlines policies on crew rest, or something else that we can remediate to prevent this sort of thing from recurring in the future