The Fars News Agency, an outlet affiliated with Iran’s Islamic Revolutionary Guards Corps, said Chinese traffic on the railway had tripled after the United States imposed a naval blockade on ships entering and leaving Iranian ports in April.

Iran’s attacks this week targeted war-weary Persian Gulf nations that host American military bases.

Kuwait said that it had intercepted three ballistic missiles, a cruise missile and 10 drones early Thursday and that falling debris had injured one person. Bahrain’s military said it had intercepted and destroyed several drones and missiles.

Iran also said that it had launched an attack on Qatar, a mediator in the sporadic peace talks between Iran and the United States. The Qatari authorities did not confirm the strikes but issued a public security alert.

The surge in fighting has driven up the price of oil. Brent crude, the international benchmark, was trading at about $76 a barrel on Thursday, down from its peak during the war of about $118 but higher than its prewar price of about $72.

The attacks prompted a new round of diplomacy by regional leaders eager to tamp down the violence.

The prime minister of Qatar, Sheikh Mohammed bin Abdulrahman al-Thani, spoke by phone on Thursday to the foreign ministers of Saudi Arabia, Oman, the United Arab Emirates and Turkey. He also spoke by phone with Iran’s foreign minister on Wednesday and condemned Iran’s attacks on ships in the Strait of Hormuz.

On Thursday, the ruler of the United Arab Emirates, Sheikh Mohammed bin Zayed, made a rare visit to Kuwait, where he met with the country’s emir and discussed strengthening ties between their countries.

Reporting was contributed by Vivian Nereim, Ismaeel Naar, Shirin Hakim, Euan Ward, James McManagan, Leily Nikounazar and Zane Irwin.