The rout in regional banks picked up steam again on Thursday morning, with several stocks suffering sizeable losses. PacWest sank 50.6% was halted for volatility multiple times. The slide began on Wednesday evening following news that the Los Angeles-based bank was exploring strategic options, including a potential sale. The bank said in a statement that it "will continue to evaluate all options to maximize shareholder value." PacWest's strategic review was first reported by Bloomberg News and later confirmed by CNBC. Meanwhile, Tennessee-based First Horizon also fell 33% after the regional lender and TD Bank announced that they were terminating their merger agreement. The banks said in a press release that the move was due to uncertainty around when TD would receive regulatory approval for the deal and was not related to First Horizon. Other notable declines included a drop of 38% for Western Alliance and about 12% for Zions Bancorp. The SPDR S&P Regional Banking ETF (KRE) was down more than 5%.