Straining to resolve a war that has dragged on far longer than he predicted it would, and one that has done lasting damage to the global economy, President Trump has threatened to attack any even wider array of civilian infrastructure to try to force Iran’s leaders to make a deal. Such attacks could be considered a war crime, and Iranian officials have warned they will retaliate more broadly if the United States targets civilian infrastructure.

The U.S. military struck bridges and a port facility in Iran, according to Iranian state media, which said the targets included rail and road connections between the southern coast and the rest of the country. Strikes also hit a railway station near the Bandar Abbas naval base, and a control tower at the Chabahar port on the Gulf of Oman was also destroyed in an attack, according to Iran’s state broadcaster.

The U.S. military’s Central Command said it had hit the tower, describing it as being part of a maritime surveillance network that Iranian forces used to surveil shipping traffic in the Strait of Hormuz. In a separate statement early Friday, the U.S. military said the latest round of American attacks had “hit dozens of Iranian military targets such as coastal surveillance and air defense sites, military logistics infrastructure and maritime capabilities.” The statement made no mention of civilian infrastructure.

Eight people were killed and 20 others wounded in the U.S. attacks across Iran, the state-run Islamic Republic News Agency reported on Friday.

The Iranian military said it had retaliated by firing on Middle Eastern countries that hosted U.S. military facilities, including Bahrain, Kuwait, Oman and Qatar. Kuwait’s government said a power plant and a water desalination facility were hit, igniting fires and damaging several generators. Kuwait’s army said several personnel were wounded by Iranian drone strikes on military facilities overnight.

Attack drones were also shot down early Friday in Erbil, the capital of Iraq’s semiautonomous Kurdistan region, according to a statement from the regional counterterrorism force. It did not identify the source of the drones, though Iraqi Kurdistan hosts U.S. forces and has repeatedly come under fire from Iran and Tehran-aligned Iraqi militias since the war began.

A tanker in the Strait of Hormuz, off the coast of Oman, was struck by a projectile on Friday, according to United Kingdom Maritime Trade Operations, a monitoring agency run by the British Navy. The ship reported minor damage and no crew members were harmed, the agency said.

The strait is a major conduit for the global oil and gas trade, and Iran has repeatedly fired on commercial ships as it battles the United States over control of the key waterway. The U.S. military this week resumed enforcement of a blockade of Iranian ports as part of its pressure campaign on Tehran.

The Iranian Energy Ministry issued a statement on Friday, carried by the state broadcaster, asking residents of southern provinces to shut off air-conditioning for an hour during peak periods of use. Temperatures in Bandar Abbas, the capital of Hormozgan Province, were forecast to top 100 degrees Fahrenheit in the coming days.

Here’s what else to know:

• Bandar Abbas attacks: A teacher in the southern Iranian port city said in an interview that airstrikes there in recent days had largely targeted the airport and air force facilities, and the area where docks and naval forces were. “The ground was shaking,” the teacher said, asking to be identified by her first name, Marzieh, out of fear of government reprisal. “It is truly terrifying.”

• Oil prices: Brent crude, the global benchmark for oil, rose 1.5 percent on Friday, to between $85 and $86 a barrel. The renewed hostilities between the United States and Iran have caused shipping traffic in the Strait of Hormuz to largely halt.

Yeganeh Torbati, Erika Solomon and Jenny Gross contributed reporting.