(Bloomberg) -- Western Alliance Bancorp and other US regional bank stocks sank in afterhours trading as PacWest Bancorp plunged following a report that it’s said to weigh strategic options including a sale.Most Read from BloombergZelenskiy Denies Ukraine Sent Drones to Hit Putin, KremlinNigeria Targeted a UK Mansion; Its Next Leader’s Son Now Owns ItUS Looks Past India’s Rights Record as China Worries DeepenCarl Icahn’s Wealth Plunges $10 Billion on Hindenburg Short-Seller ReportBanker Pay Surge