WASHINGTON — The United States said yesterday it had attacked Iranian rocket launchers on a small island in the Strait of Hormuz, its first strikes on Iran in a month, prompting Tehran to retaliate.

The US strikes resulted in “casualties,” said Iran’s Revolutionary Guard Corps, which in turn attacked US military targets in Jordan, state media reported.

The Guards “targeted technical infrastructure, maintenance facilities, and enemy fighter jet positions at the US-operated King Hussein and Al-Azraq airbases in Jordan” with ballistic missiles, causing “heavy damage,” according to state TV.

The exchange of strikes came shortly after the US-Iran war hit the six-month mark, and at a time when hostilities had been subsiding.

The US said its attacks were aimed at preventing Iran from launching more sea mines into the strait, days after it announced it had completed clearing explosives from the strategic waterway.

“Earlier today, US forces struck two Iranian launchers on Larak Island,” a US Central Command spokesman said, adding that Iran’s Revolutionary Guards “were observed preparing to launch rockets with sea mines into the Strait of Hormuz.”

In recent weeks, the Trump administration has prioritized “economic warfare” over military strikes on Iran.

Iran has effectively blocked the Strait of Hormuz, a strategic sea lane through which one-fifth of the world’s oil passed before the United States and Israel started hostilities with airstrikes on Iran on February 28.

“Last week, CENTCOM completed clearing sea mines from the strait’s international shipping routes,” said Navy Captain Tim Hawkins, a spokesman for US Central Command.