The stock market tumbled on Tuesday as investors grew increasingly worried about the health of the banking sector and the potential for a recession. The Dow Jones Industrial Average fell more than 350 points, while the S&P 500 and the Nasdaq Composite lost more than 1 percent. The sell-off was sparked by concerns about First Republic Bank, a regional lender that was seized by regulators on Monday. The bank's failure has raised fears that other regional banks could be in trouble, as well. Investors are also worried about the prospect of a recession. The Federal Reserve is expected to raise interest rates by another quarter-point on Wednesday, but some economists believe that the central bank may need to raise rates more aggressively to cool inflation. Investors are also selling off stocks in other sectors that are sensitive to economic conditions, such as energy and materials.