Here is a photo of one of the blades (can't find if this has been confirmed by NTSB). Note the big chunk out of the trailing edge near the trim tab. Spindle looks attached but hard to tell from this pic what part on that end might have failed.
From this site:
TreasureWorks - Helicopter Blade Recovery - TreasureWorks Forum
Last edited by Matari; 9th Jan 2013 at 04:17.