Trump said he decided to hold off on ordering American forces to carry out new massive strikes against Iran at the urging of Gulf allies.
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.
The U.S. military has attacked Iran after it said Tehran struck three ships in the Strait of Hormuz.
Crowds of hundreds of thousands chanted "Death to America" and "Death to Israel," as they called for revenge over the Feb. 28 attack.
The U.S. military has launched a second round of airstrikes targeting Iran at President Donald Trump's direction.
U.S. Vice President JD Vance says talks with Iranian officials in Switzerland have laid a "good foundation for a successful final deal" to end the war involving the U.S. and Israel.