Stock markets in the U.S. dropped amid concerns that the U.S.-Israel attacks on Iran could drive up energy costs.

President Donald Trump’s decision to topple the Iranian regime is threatening to torch an oil market his administration has been at pains to keep cool since he returned to office.

Global investors reacted to the weekend strikes in the Middle East by selling U.S. stocks in futures markets. Some assets may benefit, however.

World leaders have been responding cautiously amid U.S. and Israeli strikes on Iran, reports of its supreme leader's death and fears of a wider war

The jump in oil prices could lead to a jump in prices as soon as Monday, but it won't be a spike, an analyst said.

Israel and Iran continued to trade fire yesterday, with Iranian drone and missile barrages setting off sirens across Israel and hitting ports in Dubai and Oman. At least 45 people were reported killed yesterday across the region.

Oil prices rose nearly 10 percent on Monday, underscoring the economic risks of the widening conflict in the Middle East. The U.S.-Israeli attacks on Iran could severely restrict supplies from a key oil and gas-producing region.

The U.S. strikes on Iran and Iran’s retaliation on neighboring countries have put the safety of the Strait of Hormuz route for cargo ships and oil tankers into question. NBC News’ Allie Canal reports on how these disruptions could affect the price of oil and increase the cost at the gas pump for Americans.