According to today's WSJ article the Italian crypto exchange BitGrail was hacked. $170 m worth of NANO (17 million coins) stolen on Friday. NANO was initially named RaiBlocks and the price fell almost 7% right after the news broke. The money will not be returned to customers.
Here is the link:
https://www.wsj.com/articles/cryptocurrency-worth-170-million-missing-from-italian-exchange-1518241679
