Iranian state media is reporting that at least one person was killed and four others were injured in the latest wave of U.S. strikes against Iran.

Those affected were at an agricultural water pumping station in Mahshahr city, according to FARS. The person killed was the guard of the complex, the outlet said.

U.S. Central Command said the strikes targeted Iranian military air-defense systems, coastal radar sites, missile and drone capabilities, and small boats.

On Sunday, Iranian forces fired on commercial vessels in the Strait of Hormuz while U.S. forces were conducting strikes on Iranian targets, according to a U.S. official.

The official added that U.S. aircraft shot down an Iranian cruise missile and a one-way attack drone that were targeting the vessels. It’s unclear whether any vessels were damaged in those attacks.

-ABC News' Steven Beynon

Following a wave of U.S. strikes on Iranian targets on Sunday, Iranian Deputy Foreign Minister Kazem Gharibabadi released a statement, saying, "No action against Iran should go unanswered."

A spokesperson for the foreign minister also called the U.S and Israel's attacks "the continuation of a blatant and unprovoked act of aggression."

Addressing Iran's strikes on American assets in the Middle East, the spokesperson said, "Iran’s strikes on U.S. military bases and assets stationed in the southern Persian Gulf constitute a legitimate and lawful exercise of its inherent right to self-defense under international law."

The U.S. conducted a new round of strikes on Iranian targets on Sunday, a U.S. official told ABC News.

The targets included Iranian air defense systems and IRGC small boats around the Strait of Hormuz, the official said.

The strikes were intended to degrade Iran’s ability to target commercial shipping, according to the official, who said no U.S. troops were wounded in the attacks.

-ABC News' Steve Beynon