"The attack drones posed an immediate threat to regional maritime traffic," writes the US military command Centcom on X.
Tonight's attack is the latest between the two countries. On paper, there is a ceasefire in the war that the US and Israel began in February, but it is broken daily.
Despite the attacks raising concerns that the ceasefire could collapse, US President Donald Trump says that "the situation with Iran seems to be going pretty well."
"We will get out of Iran very quickly, and it will be very strong one way or the other, whether it is via a piece of paper or the hard way," he says.
In an interview with NBC News, Trump claims that Iran has just over 20 percent of its missiles left.
"They still have the capacity. They have some missiles, they have some drones. I would say, percentage-wise, they have maybe 21 or 22 percent of their missiles," the president says.
The figure for Iran's missiles is higher than the 18 percent the president stated in May. Trump has repeatedly claimed that Iran's combat capability is completely destroyed.
On Friday, Iran's military said that it had fired what it called warning missiles at two American military ships in the Gulf of Oman; the US military denied this.
Earlier this week, Kuwait said it had intercepted 30 ballistic missiles fired in what it called an "Iranian aggression."
