NEW YORK — Oil prices are rising, and stock markets are dropping worldwide Wednesday after President Donald Trump raised doubts about the temporary truce in the war with Iran.

The S&P 500 fell 0.8% after Trump said the agreement to pause fighting was “over,” though he added that he would allow negotiations to continue. The Dow Jones Industrial Average was down 745 points, or 1.4%, as of 11 a.m. Eastern time, and the Nasdaq composite was 0.7% lower.

The action was stronger in the oil market, where the price for a barrel of Brent crude climbed 7.2% to $79.48. That’s still well below its peak from earlier in the war, when the price for the most actively traded contract reached nearly $120. But the jump is unsettling because oil…