Flash trades or some other games... high vol at exactly same time... all 12 of my mlp's have recovered or are. Criminals made money and many bailed out. Imagine non-day-traders rode out the cycle and are just fine. Will be interesting to see if anything is discovered, doubt it.
Nothing will be "discovered" mostly because no one will look for anything.
This kind of mkt manipulation used to be an art that few saw, then the traders got those hi spd computers placed right next to the exchange servers, wrote some code, and the mkt manipulation is apparent for everyone to see.
The bext ezample I know of, because I owned it at the time, was DNDN crashing from 25 to 9 in a few minutes near the end of the day, many people put in market sell orders (DNDN had just gotten FDA approval for Provenge, and people thot something went wrong). All those mkt orders were executed at under 10 bucks, since there were no buyers, who do you think did all that buying at 9-10?sh?
The next day or 2 it went back to the 20's. The SEC looked into the matter, the most clear case I have ever seen of mkt manipulation, and they found no fault.