Not sure this was already mentioned here:
Pathologists in St Petersburg separated victim's bodys/parts into two groups -- those seated in front and those towards the tail. Those who seated in front sustained mainly chest, stomach, legs, arms injures, internal organs tear. Deaths mainly resulted from loss of blood, shock and brain injures.
Those who seated in the rear were found to sustain explosion injures and heavy burns (more than 90%). Experts attributed this to fuel tank explosion or explosion device detonation. Also a lot of metal pieces and aircraft skin parts were found in body's of those seated in the rear.
Source
http://lenta.ru/news/2015/11/03/results/