The Dow Jones Industrial Average plunged 900 points on Thursday as the war with Iran escalated and oil prices continued to climb.
The Dow fell 908 points, or 1.8%, while S&P 500 dropped 1%. The tech-heavy Nasdaq declined 0.9%.
Investors erased stock gains added a day earlier, resuming market turmoil set off by the U.S.-Israeli attack on Iran over the weekend.
Oil prices jumped as traders feared a prolonged blockade of the Strait of Hormuz, a trading route that facilitates the transport of about one-fifth of global oil supply.
U.S. crude oil prices topped $79 on Thursday, hitting their highest level since June.
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