DUBAI, United Arab Emirates -- Kuwait, Bahrain and Qatar sounded missile alert sirens early Thursday morning warning of an Iranian attack after the United States launched a new round of airstrikes targeting Iran.

There was no immediate word of damage in the three Gulf Arab countries. Kuwait’s military said it was actively intercepting incoming drones and missiles.

On Wednesday, Iran launched attacks on Bahrain and Kuwait over an earlier round of U.S. airstrikes against Iran. The latest U.S. strikes began Wednesday, hours after U.S. President Donald Trump said that recent Iranian attacks on ships in the Strait of Hormuz signaled the end of the fragile ceasefire.

The action raised fears that the war in Iran could reignite, coming just a day after the U.S. military hit a variety of military sites and port facilities following Iran’s targeting of several merchant vessels off the coast of Oman.

Military officials said in a social media post Wednesday that the latest strikes were intended to “further degrade” Iran’s ability “to threaten freedom of navigation” in the strait, through which a fifth of the world’s traded oil and natural gas passed before the war began with U.S. and Israeli attacks on Feb. 28.

Iranian state media reported explosions in several locations, including Bushehr, home to Iran’s nuclear power plant complex, and the southern port cities of Chabahar, Konarak, Bandar Abbas and Sirik.

Trump warns that `it will get much worse’ if attacks on shipping happen again

After leaving a NATO summit in Ankara, Turkey, Trump posted several videos on his social media site of what he said were explosions in Iran and issued another warning to the Islamic Republic.

“This is in retribution for yesterday’s bombing of ships by Iran. If it happens again, it will get much worse!” Trump wrote.

Trump had said earlier in the day that the latest back-and-forth fighting would not result in “long-term” military action.

“Anything that happens is going to happen very fast,” Trump said, though he also suggested the U.S. military might “just finish the job.”

Trump also renewed his past threats to hit Iran’s civilian infrastructure, including electric plants and desalinization plants, and to seize the oil-production hub of Kharg Island.

After three tankers were hit Tuesday, the U.S. launched strikes on Iran, and Iranian forces retaliated by attacking American military sites in the Persian Gulf.

Iran has asserted that the interim ceasefire deal gives it the right to manage traffic through the strait. Parliament Speaker Mohammad Bagher Qalibaf, a key negotiator in talks seeking a permanent end to the war, was defiant in a post on X: “The era of bullying and extortion is over. It leads nowhere. We don’t fold.”

Strikes raise fears that war could resume

Trump fuelled concerns that the war could restart by saying the interim agreement to pause fighting was “over,” although he added that he would allow negotiations to continue.

Attacks have repeatedly threatened the shaky ceasefire, but Trump’s comments added new uncertainty, and oil prices shot up after he spoke. A renewed conflict could engulf the wider Middle East and would likely again halt energy shipments through the strait.

“For me, I think it’s over,” Trump said when asked about the status of the ceasefire. He added that U.S. representatives can continue negotiations, but he cast doubt on the outcome. “They can talk, but I think they’re wasting their time,” he said.

Iranian Deputy Foreign Minister Kazem Gharibabadi, also a top negotiator, retorted on X that Trump’s remarks “are not a sign of power but an admission of the failure” of U.S. policy toward Iran.

Trump has threatened to seize Kharg Island at previous points in the war, including last month, when he also questioned whether the U.S. “has the stomach for it.” Some 90 per cent of Iranian oil exports pass through the island.

The new attacks on ships in the strait, despite the negotiations, could reflect a divide among Iran’s leadership. Hard-liners seek lasting control over the waterway, which is a globally important conduit for fuel shipments and has become a critical lever in confronting the West. Pragmatists want a permanent peace deal to lift international sanctions and provide desperately needed economic relief.

Negotiations to reach a final deal had been due to start after the dayslong funeral for Iran’s Supreme Leader Ayatollah Ali Khamenei, who was killed Feb. 28 in the war’s first moments. The funeral, which ends Thursday, was supposed to be a period of lower tensions.

The talks are meant to focus on the toughest matters, including fully reopening the strait and rolling back Tehran’s disputed nuclear program.

U.S. military says it hit air defences and small boats

On Tuesday, the U.S. military’s Central Command said American forces hit Iranian targets including air-defense systems, radars and over 60 small boats used by Iran’s paramilitary Revolutionary Guard.

Those boats have been key to threatening ships in the strait. Iran’s ability to bring shipping in the waterway to a near halt during the war proved its greatest strategic advantage.

On Wednesday morning, both Bahrain, home to the U.S. Navy’s 5th Fleet, and Kuwait, home to U.S. Army forces, sounded missile alerts. The Revolutionary Guard issued a statement acknowledging targeting U.S. military installations in both countries.

Kuwait said it intercepted two ballistic missiles and 13 drones launched by Iran. The Kuwaiti Electricity Ministry said a number of lines were out of service after shrapnel fell on them.

U.S. revokes licence allowing the sale of Iranian oil

After the Iranian strikes on shipping, the U.S. revoked a license that -- for the first time in years -- had allowed Iran to conduct oil sales openly in U.S. dollars, as part of the interim deal.

Iran and the United States agreed as part of the interim deal to allow ships to pass through the strait without paying charges for 60 days. But Tehran has insisted it must control the vessels’ routes and vowed to later charge fees for passage. That would upend decades of practice in the waterway. The ships attacked Tuesday all appeared to be using a route close to Oman’s shore, rather than one ordered by Tehran.

The U.S. and many Gulf Arab states say they will not agree to Iran charging for passage through the strait.

Elsewhere, Iranian President Masoud Pezeshkian, Iraqi Prime Minister Ali Falah al-Zaidi and other Iranian and Iraqi officials attended funeral ceremonies for Khamenei on Wednesday in the Iraqi city of Najaf.

Khamenei’s body will be returned to Iran to be buried Thursday at the Imam Reza shrine in Mashhad, his birthplace.