Supposedly a high-powered journalist in China wrote an article on how China is planning to shutdown all local BTC exchanges. But its vague article and people now believe it's making reference to the ICO banning.
http://www.allcryptocurrencies.news/bitcoin/bitcoin-crash-of-8-september-due-to-fake-chinese-news/
Simultaneous reaction of CCs to such news - a clear evidence that the entire CC space is being run by the Wall Street Algos.