https://www.bloomberg.com/features/2017-the-ether-thief/
"An internal investigation by one such exchange concluded that the DAO attacker was likely part of a group, not a lone wolf, based in Switzerland, according to an executive there who wouldn’t speak on the record or allow the company’s name to be used. Exchanges are in the unique position of being able to analyze the trading activity of their customers because they know who they are, even if they’re anonymous on the blockchain. The executive says the exchange shared the analysis with the Boston office of the FBI, though there’s been no further contact since October of last year."
WHAT?!
lol.