Tentatively, a witness spotted sparks coming from the plane, as it was taking off, which makes them think a tire blew on take-off. The pilot tried to abort take-off, but it was too late.
Haven't heard the news today, but as of last night they were reporting here that tire debris was found on the runway, but no one as yet wanted to commit if that was causal, contributory or unrelated.
But, here's the thing. The debris was found about 2800 or so feet from the end of a runway that's over 8000 feet long. If she (the pilot) had wanted to abort, she should have had plenty of room to do so.
At least that's what was reported on local news last night. As of last night, NONE of this info was coming from NTSB.