Funny how every catastrophic failure seems to occur while "just riding along." I count at least 10 sheared-off spokes. Most of them don't even look bent, and the tire appears to still be inflated. I'm gonna concur with @
base2 on this one, something went into the spokes, and that something was intent on serious business.
A bike came into the LBS for repairs with a similar looking fork-- only this rider had gone full-blast into a guardrail. Wheel and bottom half of the fork stopped, rider and rest of bike kept going. Not nearly as many broken spokes, but the wheel was much more oval.