US equities tumbled on Tuesday, undoing a Monday equity comeback, as oil prices spiked again and traders began to worry the U.S.-Iran conflict could drag on longer than anticipated. The Dow Jones Industrial Average lost 1,238 points, or 2.5%. If that holds, it would mark the blue-chip index’s first 1,000-point decline since April 10, 2025. The S&P 500 slipped 2.2%, while the Nasdaq Composite was down 2.3%. Brent crude oil, the international benchmark, topped $84 a barrel, up 8% Tuesday following a 6% spike Monday. WTI crude jumped 8% to above $77 a barrel after a 6% jump as well on Monday. Iranian Revolutionary Guard commander said the Strait of Hormuz — the world’s most vital transit route for crude oil — is closed and that Iran would set ablaze ships attempting the route, Reuters reported, citing Iranian media.