[UPDATE] U.S. forces struck IRGC air-defense, radar, maritime and mine-laying sites on Iran's southern coast starting at noon on Sept. 1

Trump said a bigger attack was "waiting in the wings" and that afterward "there will be very little left" of Iran's government; Iran's armed forces vowed to "impose a heavy cost on the American enemy."

U.S. forces struck Revolutionary Guard air-defense, radar, maritime, mine-laying and communications sites across Iran's southern coast beginning at 12 p.m. ET on Tuesday, Sept. 1, hitting about 100 targets in an attack that ran roughly six and a half hours. The Revolutionary Guard is a branch of Iran's armed forces separate from the regular army. Iranian military bodies said they would retaliate again, and Trump said heavier strikes would follow any Iranian response. The stated justification was recent attempted attacks on commercial shipping in the Strait of Hormuz and on American service members. Iranian state media reported that a strike at a wedding in Kuhestak, in Hormozgan province on the strait's north shore, killed four people. Central Command said it was aware of those reports and did not claim the strike. Neither side has released a damage assessment or a casualty total for the day's roughly 100 targets.

PREVIOUSLY

Jul. 23 — Trump threatened to bomb Iranian bridges and power plants for every ship hit in the Strait of Hormuz.
Jul. 28 — Iran fired ballistic missiles at a U.S. base in Jordan; all were intercepted.
Aug. 4-5 — Tehran denied Trump's claim that new talks would begin, and a cargo ship was struck in the strait.
Aug. 10 — Iran said it would keep Hormuz closed until Washington unfroze its assets, lifted the blockade and restored the June memorandum.
Aug. 17 — A projectile killed a crew member aboard a ship leaving Hormuz.
Aug. 18 — With a 60-day talks window expiring, Trump threatened to bomb Oman, the ally brokering the reopening deal.
Aug. 20 — Trump declared an "economic D-Day" on Iran and threatened third countries, as only 10 to 12 ships a day crossed the strait, 85% below normal.
Aug. 29 — After nearly a month without large strikes, the administration called its military goals complete and shifted to an open-ended sanctions campaign.
Aug. 31 — U.S. forces destroyed two rocket launchers on Larak Island loaded to mine the strait, killing two; Iran answered with eight missiles at Jordan, all intercepted, and Brent crude passed $90.

What each acknowledged U.S. strike inside Iran has hit since 2025:

Sept. 1, 2026: about 100 targets in roughly 6½ hours, from noon until Central Command announced completion at 6:33 p.m. ET.
June 22, 2025, "Midnight Hammer": three nuclear facilities, about 75 weapons, roughly 30 minutes.
Feb. 28–April 2026: the opening campaign struck about 13,000 targets over 38 days.

SEMI-RELATED

Jordan says its air defenses intercepted 10 of 13 ballistic missiles crossing its airspace, with three landing in uninhabited areas

No casualties were reported. This was a separate, larger volley than the eight missiles Jordan's military said it destroyed earlier.

A projectile hit a ship's engine room during an outbound Hormuz transit on Aug. 17, killing a crew member

Maritime monitors logged a second vessel attacked two days earlier, on Aug. 15, and a tanker struck by three projectiles east of Oman on Monday, Aug. 31. None of the three attacks has been publicly attributed to the Revolutionary Guard.

Russia has secretly helped Iran build a supersonic cruise-missile engine since 2023, the Financial Times reports

A multiyear program the FT identifies as C430L put experienced Russian missile specialists to work on a ramjet, the engine that lets a cruise missile hold several times the speed of sound and that would put U.S. carriers in the Gulf within reach. The account rests on leaked Russian correspondence and patent filings. Iran has built and flight-tested the engine; no Russian-assisted missile has been seen in use.

Putin told Iran's president on Sept. 1 that Russia will keep supplying "necessary goods" through the war, and said he has ordered large-scale strikes on Ukraine's power grid

The pledge came at the Shanghai Cooperation Organization summit in Kyrgyzstan, where Putin met Iranian President Masoud Pezeshkian and the bloc's leaders condemned the U.S. strikes for "numerous civilian casualties." The same day Putin called reports of a new Russian mobilization "absolute nonsense." Iran supplied Russia the drone designs it has used against Ukraine since 2022.