U.S. forces have struck Iranian rocket launchers on the Strait of Hormuz in the first military action in a month, a U.S. official said Sunday.

Semiofficial news outlets in Iran reported sounds of explosions near Larak island on the strait.

Forces with the Revolutionary Guard Corps were observed preparing to launch rockets with sea mines into the strait, according to the official, who spoke on condition of anonymity to detail sensitive military movements.

The U.S. military last week completed clearing sea mines from the strait’s international shipping routes.

Iran’s Revolutionary Guards vow response to U.S. attack on Larak island

Iran’s ​Revolutionary ‌Guards said ​a U.S. ⁠attack on Larak ‌Island killed ⁠and ⁠wounded several Iranian fighters and ​civilians, ‌and vowed to respond ‌and ​punish those responsible, state ⁠broadcaster IRIB reported.

The ‌Guards did not provide ‌a precise ​casualty toll.

(With inputs from AP and Reuters)