The attacks are the latest to test a shaky ceasefire, sending oil prices up more than two per cent, as the strait remains largely closed more than three months after the US and Israel launched strikes on Iran.
Flights at Kuwait International Airport were suspended after an Iranian drone and missile attack damaged airport facilities and diplomatic missions, killing one person and injuring more than 60 others, Kuwaiti authorities and state media said.
Kuwait Airways and Jazeera Airways later resumed flights after taking safety measures, the civil aviation authority said.
Earlier, Iranian media reported that Iran's elite Revolutionary Guards had attacked the headquarters of the US Fifth Fleet in Bahrain and a US airbase, as well as a vessel identified as Panaya. US Central Command denied its bases had been hit and said Iranian ballistic missiles failed to strike their targets in the region.
CENTCOM said it had carried out a new round of "defensive strikes" in southern Iran, targeted missile launch sites and Iranian boats seeking to lay mines, and conducted strikes on Qeshm Island near the Strait of Hormuz after attempted Iranian attacks.
Hostilities have occasionally flared up in recent weeks despite a ceasefire agreed in early April, as the US has pushed to reopen the Strait of Hormuz, a route that handled roughly a fifth of global oil and liquefied natural gas shipments before the war.
Last week, Iran and the US signalled progress towards a tentative initial agreement to halt the war and reopen the strait, but the two sides have yet to sign off on the deal, which would leave more complex negotiations for later.
Mohsen Rezaei, military adviser to Iran's Supreme Leader Ayatollah Mojtaba Khamenei, said Iran would not allow the US to "overreach" either in negotiations or ceasefire arrangements. In a post on X, he warned that any aggression would be met with a barrage of missiles and drones.
Anwar Gargash, diplomatic adviser to the United Arab Emirates president, said repeated attacks on Kuwait and Bahrain required a firm and cohesive Gulf response.
"The aggression does not target one country alone, but all of us," he wrote on X.
Since mid-March, Trump has repeatedly said he is close to a deal to end the fighting and pave the way for negotiations on thorny issues including the future of Iran's nuclear program.
Tehran has conditioned a deal on an end to fighting in Lebanon. It also wants access to billions of dollars in oil revenues, waivers on sanctions on crude exports, a lifting of a US blockade on its ports and continued leverage over the strait.
Trump, who is under pressure to bring down US fuel prices while not making concessions to Iran, has said his top priority is to stop Iran from acquiring nuclear weapons. Iran says its atomic program is for peaceful purposes.
Trump has said negotiations are continuing, though Iran's semi-official Tasnim news agency said on Wednesday that Iran had not responded to the US in recent days and that exchanges of texts through intermediaries were suspended until Iran's conditions on Lebanon are met.
In a podcast interview released on Wednesday, Trump said Iran had agreed to not have a nuclear weapon and that Khamenei was involved in negotiations.
"They've already agreed they're not going to have a nuclear weapon," he said.
The war has killed thousands, mainly in Iran and Lebanon, while causing global economic pain by severely disrupting energy supplies and other shipping.
In his podcast comments, Trump acknowledged having called Israel's Netanyahu "crazy" in a reportedly expletive-filled phone exchange over the fighting in Lebanon as he sought a deal over the wider war.
"At some point I said, Bibi, we got to stop this. We got to stop it," Trump said, referring to Netanyahu by his nickname.
In his interview for CNBC, Netanyahu said he and Trump sometimes had "tactical disagreements" but that they agreed on the main issues concerning Iran.
