The Associated Press reports that
National Transportation Safety Board officials have issued a preliminary determination that pilot error contributed to the accident, and that the Senator was flying a single engine aircraft in IFR (instrument flight rules) conditions while only having obtained a VFR (visual flight rules) rating.
The absence of a post-crash fire was likely due to insufficient fuel on board. No one on the ground was injured.
Photographs below were taken at the scene show the extent of damage to Senator Clinton's aircraft.
She was very lucky not to have been seriously injured.