I will not guess upon the reason for the accident.
Let NTSB inform us of what has happened!
It is always sad when they happen
But here is a link to a serious incident of same type of A/C on approach in Sweden.
Even though there might be no connection between this accident and the incident in Sweden, it might be very good idea to read this report if you operate a turboprop.
http://www.havkom.se/virtupload/news/rl2007_12e.pdf
Walder