Carbon composite broken, (pictures)

Knowing a little about bicycles and composites, I do know that mountain bikers tend to abuse their bikes. It would take closer investigation, such as microscopy to see if there were poorly bonded layers. A carbon composite can brittle fracture like some metals but I think filament wound tend to delaminate. At any rate, these pictures, in my opinion are not adequate. Frank

hard to tell from those pictures, but looks like some type of environmental attack.