Here is one of the articles: https://www.reuters.com/article/us-crypto-currencies-bitfinex/ing-says-cryptocurrency-exchange-bitfinex-has-an-account-with-it-idUSKCN1G42MU
I find the last paragraph in that article to be hinting at more complications for Bitfinex. The Tether drama is still weighing on the market and any news regarding Bitfinex and Tether usually causes a sell-off.
It's too early to tell if this will actually bring any real regulation or how long it would take. Markets are jittery like this though so it could be contributing to the current correction in prices.