NEW YORK/LONDON, April 13 : Wall Street stock indexes were mixed and oil jumped back above $100 a barrel on Monday as the U.S. moved to block https://www.reuters.com/world/middle-east/us-blockade-iran-after-talks-fail-yield-a-deal-2026-04-13/ ships leaving Iran's ports after peace talks collapsed at the weekend. A fragile ceasefire hung in the balance as the U.S. put pressure on Tehran, prolonging a choke on Middle East energy exports and sending jitters through equity markets. The Dow Jones