NEW YORK – With no clear end in sight, the war with Iran is sending oil prices back to $100 per barrel and stocks sinking worldwide on Thursday.

The S&P 500 fell 1.1% and is returning to big swings following a couple days of relative calm. The Dow Jones Industrial Average was down 588 points, or 1.2%, as of 10 a.m. Eastern time, and the Nasdaq composite was 1.4% lower.