U.S. stocks tumbled Monday as the Middle East conflict widened, triggering a broad market selloff. The Dow Jones Industrial Average dropped sharply, with all major indices posting significant losses as investors fled riskier assets amid escalating regional tensions. Energy stocks led the decline, while safe-haven assets like gold and Treasury bonds saw increased demand.

The market rout came as geopolitical uncertainty rattled investors already concerned about inflation and interest rates. The S&P 500 and Nasdaq Composite both posted their worst daily performance in weeks, with technology and growth stocks hit particularly hard. Trading volume surged as volatility spiked across global markets.

The selloff underscores how quickly geopolitical events can derail market momentum. With the Federal Reserve's next policy meeting looming, traders are now weighing how the Middle East escalation might impact monetary policy decisions and corporate earnings forecasts.