U.S. stock indices declined Tuesday as investors reassessed economic data and geopolitical tensions pushed crude oil sharply higher. The S&P 500 fell 0.8% while the Nasdaq Composite dropped 1.2%, with technology stocks bearing the brunt of selling pressure. The Dow Jones Industrial Average slipped 0.5% as defensive sectors including utilities and consumer staples outperformed growth names.

West Texas Intermediate crude surged 3.4% to breach $78 per barrel, driven by escalating Middle East tensions and supply concerns. Brent crude climbed above $82 per barrel on similar geopolitical friction. Energy stocks bucked the broader decline, with the Energy Select Sector SPDR gaining 1.9% as oil majors benefited from elevated commodity prices.

The moves reflected a classic risk-off rotation. Bond yields compressed as investors fled equities for safer assets. The 10-year Treasury yield declined to 4.15%, signaling demand for government debt as a haven. Volatility spiked, with the VIX index climbing to 18.5, above its 50-day average and reflecting renewed uncertainty in markets.

Economic data painted a mixed picture. Weekly jobless claims came in higher than forecast at 235,000, signaling potential labor market softening. Inflation readings remained sticky, keeping Federal Reserve rate-cut expectations subdued. Traders scaled back bets on a December rate reduction, now pricing just a 35% probability of a quarter-point cut versus 60% a week prior.

The yield curve inversion between 3-month and 10-year Treasury rates deepened, a recession signal that weighed on cyclical stocks. Financial services names fell alongside banks dependent on steeper spreads for lending profitability.

Crude oil's rally commanded the most immediate attention for energy traders and portfolio managers with commodity exposure. Airlines and transportation companies felt margin pressure from higher fuel costs, with Southwest Airlines and Delta Air Lines declining 2.1% and 1.8% respectively.

Gold climbed 0.6% to $2,035 per ounce, another safety play reflecting deteriorating risk sentiment. Bitcoin fell 2.3% to $42,100, suggesting crypto weakness followed broader equity declines despite traditional haven demand.

Investors watch for Federal Reserve speakers this week and next month's jobs report for clues on monetary policy direction. Oil markets remain sensitive to any news from the Middle East or OPEC production decisions.