Following the collapse of the U.S.-Iran ceasefire deal, scores of American troops have been injured and at least four service members have been killed.
The U.S. military says it has reimposed its blockade of Iranian ports in response to Iran's attacks on commercial ships in the Strait of Hormuz.
A spike in oil prices over recent days amid a resumption of fighting, however, threatens to push gas prices higher, erasing some of the relief delivered last month.
The U.S. launched strikes on Iran, hours after President Donald Trump said Washington is "reinstating" a blockade on Iran in the Strait of Hormuz.
The U.S. military said it has launched another round of strikes against Iran "to degrade their ability to attack commercial ships freely transiting the Strait of Hormuz."
Iran said it considers the Strait of Hormuz closed once again after a vessel using an "unauthorized route" was struck by a warning shot. U.S. Central Command said a short time later that its forces began a third round of strikes against Iran.