The South Korean exchange Coinrail.kr stated on Twitter® “There has been an cyber intrusion in our system”:
해킹공격시도로 인한 시스템 점검중입니다. 일부코인(펀디엑스,NPXS)이 확인되었으며 추가적인 코인피해가 있는지 여부를 확인중입니다. 추후 자세한 사항은 재공지하겠습니다 / There has been an cyber intrusion in our system. We're confirming it and some coins(Pundi X, NPXS) are confirmed.
— coinrail (@Coinrail_Korea) June 10, 2018
Shortly thereafter the price of bitcoin tanked on Bitfinex:
XBTLivePrice – June 10 2018
Bitfinex, Binance, OKEx and Bitstamp all saw precipitous drops down to the $ 6700 range: