Cartels are dumping Bitcoin at a price lower than last dip to make huge money from "Bitcoin Futures".
They may be losing 4-5k per Bitcoin but making 10-20k profit from "Bitcoin Futures". This must be stopped at any cost otherwise crypto-currency market will die.
This is announcement from OKEx: “Dear valued customers, At 5:00–6:30 on Mar 30, 2018 (Hong Kong Time), a number of users performed unusual transactions to manipulate the price of BTC quarterly futures contract, making it deviate greatly from the BTC index. Based on our team’s investigation, the user closed a huge amount of positions at market price without considering the cost, causing it to drop to an unusually low level. We will disclose the transactions details in further notice”
Source:
https://medium.com/@super.crypto1/4th-dimension-bitcoin-manipulation-cartel-can-it-be-burnt-no-way-c53de65c166a