Stock market today: Dow, S&P 500, Nasdaq smoked as Powell warns of 'challenging' tariff impact, Nvidia plunges

All three major stock indexes head for back-to-back losses in final hour of trading

Fed Chief Jerome Powell Signals Trump Tariffs 'Tension' On Inflation, Growth; Dow Jones Extends Losses

Stock Slide Picks Up Steam. Dow Down 400 Points.

Stock Market Today: Dow, S&P 500 and Nasdaq Fall After Fed Chair Powell Warns of Economic Risks — Live Updates

Rare event could send S&P 500 tumbling again