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Found something else which is prolly the reason: a new hack.

https://steemit.com/bitcoin/@zanoni/that-s-why-bitcoin-crashed-today

In fact, more probable than the link I posted earlier.

I did find something after my last response. tl;dr: the gov. of China is extending its crackdown.

https://steemit.com/cryptocurrency/@btcchina/2tvrrg-crypto

That's the only news I've been able to fetch up.