The U.S.-Israeli war on Iran waged for a sixth day with little sign of easing, as the Islamic Republic vowed to intensify its retaliation and oil extended gains.

Arab states across the Middle East — as well as Israel — reported interceptions of Iranian missiles and drones on Thursday, with Qatar telling residents to remain indoors due to the high level of threat.

Tehran said it launched drone attacks on U.S. forces in Iraq and Kuwait, and struck an oil tanker in the Persian Gulf, underlining the risk to shipping in the energy-rich region.

Israel said it carried out a twelfth wave of airstrikes on the Iranian capital, hitting military and intelligence assets, following attacks on the Hezbollah militant group in Lebanon. At least 1,230 people have died in Iran so far, and dozens elsewhere in the region.

Iran’s Islamic Revolutionary Guards Corps said retaliatory attacks will intensify in coming days, according to the Nour news agency. U.S. President Donald Trump was similarly defiant on Wednesday, saying the U.S. is “doing very well on the war front.” The White House said it was close to “complete and total control of Iranian airspace.”

Iran pledged to respond to the sinking of a warship off the coast of Sri Lanka — the first time since World War II that an American submarine has attacked a surface vessel — which widened the geographic reach of the conflict. In all, about a dozen nations have become embroiled since the U.S. and Israel launched their campaign on Feb. 28.

Azerbaijan became the latest on Thursday, threatening to retaliate after two Iranian drones struck its territory. Iran denied any connection to the incident, the semi-official Fars news agency reported.

The possibility of a protracted war is roiling markets, with Brent oil climbing toward $83 a barrel, after spiking about 13% over the first three days of the week. Gold extended gains amid concerns the conflict could be drawn out. A global bond selloff showed no respite, with the 10-year Treasury yield rising for a fourth straight day.

Airlines remain hamstrung by the conflict, with the number of canceled flights to Middle East hubs surpassing 23,000 since fighting began. Thousands of passengers are stranded in the Gulf region.

The Islamic Republic is still to appoint a new supreme leader after the assassination of Ayatollah Ali Khamenei at the weekend, with a decision to be made “as soon as possible,” Iran’s semi-official Mehr reported.

Turkey came under fire on Wednesday, a first for a member of the North Atlantic Treaty Organization since the conflict began.

NATO said its air defenses downed the ballistic missile, and Ankara warned Tehran against acts that could further widen the war. Iran’s armed forces denied targeting “neighboring and friendly country Turkey,” according to a statement carried by Nour.

Saudi Arabia continued to thwart attacks on Thursday, saying it intercepted multiple missiles and drones overnight. Strikes have mostly been directed at Al Kharj near Riyadh, where the U.S. has a facility, or the east where Saudi Aramco operates its headquarters.

The kingdom is diverting millions of barrels of crude to a port on its Red Sea coast, helping the world’s top exporter to maintain supply as the critical Strait of Hormuz remains largely shut.

Sirens continued to sound across Israel, but the military slightly eased restrictions on workplaces and gatherings.

“We are seeing a decrease in both the number of launches from Iran and the number of missiles in each barrage,” said Israel Defense Forces spokesman Nadav Shoshani.

In Washington, the Republican-controlled Senate rejected a Democratic attempt to halt the U.S. strikes on Iran. The House, also controlled by Trump’s party, is expected to vote on a similar measure Thursday.

Trump has offered shifting explanations for the strikes, reiterating claims that Iran posed an imminent threat and saying the U.S. acted before Tehran could attack Israel or American interests.

“Their missiles are being wiped out rapidly. Their launchers are being wiped out. They’re attacking their neighbors. They’re attacking their — in some cases — allies, or not-so-long-ago allies,” Trump said. “It’s really a nation that was out of control, and they would have used it on us if we let them.”

The duration of military operations remains uncertain, with Defense Secretary Pete Hegseth telling reporters “it could be six, it could be eight, it could be three” weeks before they are wrapped up.

Traffic through the Strait of Hormuz, a maritime chokepoint vital for energy flows and container shipping, has slumped, prompting Trump to announce the U.S. would provide insurance guarantees and naval escorts if needed to ensure safe passage for oil tankers and other vessels.

While Iran military commander Amir Heydari told state TV on Thursday the strait isn’t closed, traders and analysts still expect it will take weeks before flows can resume meaningfully.

Tehran dismissed an earlier report that its Ministry of Intelligence had reached out to the U.S. to negotiate an end to the conflict as “pure falsehood.”

“We have no trust in the Americans and no intention of negotiating with the U.S.,” Mohammad Mokhber, who was an adviser to Khamenei, told Iran’s state-run television.

Israel confirmed attacking a building in Iran’s Qom used by the Assembly of Experts — a conclave that will select Khamenei’s successor. A military spokesperson also appeared to acknowledge that, as widely reported, the site was empty at the time and the clerics survived. Iran’s Nour agency said three people were killed in the attack.

Preparations were under way for Khamenei’s funeral to begin in Tehran on Wednesday, but the ceremony has been postponed to a later date, Iran’s semi-official Tasnim news agency reported.

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—With assistance from Skylar Woodhouse, Cedric Sam, Michael Ovaska, Patrick Sykes, Arsalan Shahla, Eltaf Najafizada and Galit Altstein.

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