Walmart on Thursday forecast sales and profit for the current year below Wall Street estimates, citing the need for caution in navigating an uncertain geopolitical landscape.

Stocks tumbled from all-time highs Thursday in the wake of Walmart projecting a lower-than-expected sales outlook. The Dow Jones Industrial Average fell 450 points, or 1%. The S&P 500 declined 0.4%. The tech-heavy Nasdaq lost 0.5%. Bank stocks also fell significantly, with JPMorgan Chase and Goldman Sachs also closing down about 4%.

U.S. stocks wavered Thursday after a strong run, as weak guidance from Walmart underlined nagging worries about the health of the American consumer.