California regulators have abruptly shut down Silicon Valley Bank, a 40-year-old financial institution that catered to the tech industry, due to mounting concerns that customers were on the verge of pulling their money. The closure has caused a stir in the markets, raising questions about its potential impact on the broader banking system and economy. The Federal Deposit Insurance Corporation (FDIC) has taken control of the bank and is working to protect customers and sell the bank's assets.