Two tankers were hit in the Strait of Hormuz on Tuesday, including an LNG carrier at risk of explosion, as huge crowds mourning Iran’s slain Supreme Leader Ayatollah Ali Khamenei thronged the holy city of Qom.

Qatar blamed Iran for the attack on a huge Qatari liquefied natural gas tanker, the Al Rekayyat, which reported being struck overnight by a drone that caused a fire in its engine room.

The crew were safe and being evacuated, but maritime security sources briefed on the incident told Reuters the fire on board could put the ship at risk of blowing up.

A Saudi-flagged crude oil tanker, believed to be the supertanker Wedyan, was also damaged off Oman’s coast, maritime security sources said. The cause was not immediately clear.

“Mayday mayday mayday. This is vessel Al Rekayyat, LNG vessel Al Rekayyat. We are being hit by drone on port side, top of engine room,” the Qatari tanker’s captain said in a recorded radio call reviewed by Reuters. “Status: engine room fire and full of smoke. Unable to assess further damage.”

Qatari foreign ministry spokesperson Majed Al Ansari called the incident an unacceptable attack on the security of international navigation and global energy supplies, and a clear violation of international law.

He called on Iran to immediately halt actions threatening regional security and maritime navigation, and said Tehran bore full legal responsibility for the attack and any resulting damage or consequences.

There was no immediate comment from Tehran, or any claim of responsibility. A U.S. official, speaking on condition of anonymity, said initial indications were that Iran had fired at two commercial vessels.

In another incident later on Tuesday, a tanker was struck by a drone while transiting the strait, sustaining minor damage, but was able to sail to its next port of call, British navy-affiliated agency UKMTO said in a report.

The incidents were the first reported attacks in the strait since mourning for Khamenei began last week, highlighting the ongoing insecurity for Gulf shipping more than four months after the United States and Israel launched a war they said would stop Iran threatening its neighbors.

Hundreds of Thousands Take to Streets in Qom

Iran’s clerical rulers have exerted newfound control over the world’s most important energy shipping route, where they aim to install a permanent system to collect fees in what would amount to a huge shift of the balance of power in a region where Washington has long acted as guarantor of security.

At home, the leadership has used the mourning period to show its control after Khamenei was killed with his daughter, granddaughter, son-in-law and daughter-in-law on the war’s first day.

The caskets of the slain leader and family were driven through the streets of the seminary city of Qom on Tuesday, where many hundreds of thousands of people carried flags and banners comparing Khamenei to martyrs whose deaths are foundational to the Shi’ite sect.

In chants they vowed to avenge Khamenei. Some bore placards and banners reading “KILL TRUMP”.

A similar huge funeral procession was held in the streets of Tehran on Monday, following more solemn prayer events that began last Friday, attracting top figures in Iran’s leadership and dignitaries from abroad. Authorities say the leader’s body will be taken to Shi’ite holy cities in neighboring Iraq, then brought back to Iran and laid to rest in a medieval shrine.

Trump: ‘Make a Deal or We’re Going to Finish the Job’

The war has been paused under an interim peace deal reached last month, intended to provide a 60-day period for negotiations on a permanent deal. A round of indirect talks in Qatar ended last week with no sign of headway towards a lasting peace.

U.S. President Donald Trump has repeatedly threatened to resume bombing, most recently on Monday when he told reporters in the Oval Office: “We’re either going to make a deal or we’re going to finish the job….. We can knock down their bridges in one hour, we can knock out their energy supply.”

Iran’s Foreign Minister Abbas Araqchi said that under the terms of the interim ceasefire memorandum, negotiations on the final deal would “not commence if threats continue”.

“Honor your signature,” he wrote on X.

At a NATO summit in Ankara, France and Britain were set to outline plans for a multinational maritime mission in the Strait of Hormuz at talks between NATO and Gulf Arab foreign ministers on Tuesday. Diplomats said Iran’s rejection of the initiative left little prospect of agreement on the waterway.

Oil prices, which have returned to around the prewar level since last month’s interim deal let ships resume sailing through the strait, rose more than 2% on Tuesday following the incidents in the waterway.

In launching the war four months ago, Trump said his aims were to destroy Iran’s nuclear and missile programs, end its ability to threaten its neighbors and create conditions for Iranians to topple their leaders.

None of those goals has been met, although Washington says a permanent deal will halt what it says is an Iranian program that could make a nuclear bomb, which Iran says it never sought.

(Reporting by a Reuters team in Tehran and Reuters bureauxWriting by Peter Graff; Editing by Aidan Lewis, Ros Russell and Sanjeev Miglani)