The price of Bitcoin dropped 3% in just 30 minutes after the major cryptocurrency exchange OKEx suspended withdrawals.
Source: https://cointelegraph.com/news/why-bitcoin-price-abruptly-dropped-3-in-30-minutes-on-okex-freeze
Why Bitcoin price abruptly dropped 3% in 30 minutes on OKEx freeze
October 16, 2020
CoinTelegraph