July 17 (UPI) — Iran early Friday said it struck a U.S. special operations command center in southeastern Syria, escalating the war over the Strait of Hormuz, as the United States attacked bridges and other urban infrastructure in Iran.

The Islamic Revolutionary Guard Corps described the strike in a statement as a “surprise attack” conducted in retaliation for the seven soldiers killed early Wednesday in a U.S. attack on Bampur, near Iranshahr in southeastern Iran.

The elite military unit claimed to have destroyed a U.S. radar system and several special-operations helicopters. It claimed to have killed “a large number” of Americans.

State-run media reported Iran also attacked U.S. bases and assets in Kuwait and Bahrain in retaliation for the U.S. attacks hours earlier. Islamic Republic of Iran Broadcasting claimed the United States destroyed five bridges around Bandar Abbas near the Strait of Hormuz.

U.S. Central Command said it had completed a “major wave” of attacks on Iran at 9:40 p.m. EDT Thursday. It said it hit dozens of Iranian military targets, including coastal surveillance and air defense sites, military logistics infrastructure and maritime capabilities.

Though CENTCOM made no mention of civilian infrastructure, President Donald Trump on Tuesday warned that the U.S. military would be ramping up its attacks through the week and would include civilian targets, but explicitly stating, “Next week comes the bridges.”

While the war began in late February, with the Trump administration seeking to dismantle Iran’s nuclear weapons program and encourage regime change, this latest chapter is centered on the vital shipping lane of the Strait of Hormuz.

The Trump administration is seeking to restore freedom of navigation through the chokepoint, while Iran is fighting to maintain the leverage afforded by its ability to restrict passage.

Early Friday, the United Kingdom Maritime Trade Operations center said a tanker had been struck by an unknown projectile, causing minor damage to its port side.

“All crew are safe and accounted for,” it said.

The strike is at least the eighth attack on a commercial ship to attack in the Strait of Hormuz in a little over a week.