In the latest strikes, the U.S. military's Central Command included "military logistics infrastructure" in the list of targets it said it had hit, the first time it has mentioned infrastructure in more than a week.
Iranian state media said at least five bridges were struck in the south. Seven people were reported killed in attacks on bridges in the southern port of Bandar Khamir, where the train station was also hit. An airport was reported hit further east and away from the coast in Iranshahr, in a province bordering Pakistan.
Videos verified by Reuters showed rubble, broken railings and a damaged vehicle on a smashed bridge in Bandar Khamir. One clip showed a fire.
Iranian Foreign Minister Abbas Araqchi said that three villagers were killed while crossing the Bandar Khamir Bridge, adding that Iran would not allow their blood "to be in vain."
Reuters was unable to confirm details in other reports, which described deadly attacks including one that killed a woman and wounded her child in the port of Bandar Abbas.
Iran announced attacks on Gulf countries that host U.S. airbases, including Bahrain, Qatar and Kuwait.
Authorities in Kuwait said one of the country's power generation and water desalination stations had been hit in an Iranian attack, causing damage, a fire and the disruption of a large number of electricity generation units.
Firefighters brought the blaze under control, while technical teams began assessing the damage, securing the station and working to restore power generation as soon as possible, the Ministry of Electricity, Water and Renewable Energy said.
The rich Arab Gulf states depend on plants that produce electricity and remove salt from seawater to make their desert cities habitable. When Iran hit a Kuwaiti desalination plant on March 30, it was seen as a major escalation that helped push the United States to declare the war's first ceasefire a week later.
Iran said it struck U.S. bases in Kuwait, Qatar and Bahrain, and a U.S. radar station in Oman. Explosions were heard in the Qatari capital, Doha, where the interior ministry said a child was wounded by shrapnel.
Last month's interim agreement to end the war has collapsed since July 7, when Iran struck ships in the Strait of Hormuz and the United States responded with air strikes. Iran has since announced the closure of the strait, and Washington has reimposed its own blockade of Iranian ports.
In the latest action at sea, the U.S. military said it had boarded a tanker to enforce the blockade, releasing photos of Marines rappelling down from a helicopter onto the deck where one posed in front of an Iranian flag.
Beyond the Gulf, armed assailants boarded and seized a small chemical tanker off Yemen in the Gulf of Aden, close to the mouth of the Red Sea.
Iran has signalled that it could prod its Houthi allies in Yemen to close another key strait: the Bab al-Mandeb at the mouth of the Red Sea, potentially cutting off the main alternative route for Middle East oil bypassing the Gulf. Sources have told Reuters Iran has already instructed the Houthis to act if Washington attacks Iran's infrastructure.
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