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Iran warned the United States that any attack on Iranian oil tankers or other commercial vessels would be met with a “heavy assault” on a U.S. base in the region and on enemy ships, even as a ceasefire appeared to be holding tenuously. The warning from Iran’s Revolutionary Guard came a day after the United States struck two Iranian oil tankers, raising doubts about whether the month-old ceasefire still had effect.

Iranian state television reported the Revolutionary Guard warning, while the U.S. military said the tankers were trying to breach its blockade of Iran’s ports. The U.S. position comes as Washington said it is waiting for Iran’s response to its latest proposal for a deal aimed at ending the war, reopening the Strait of Hormuz to shipping, and rolling back Iran’s disputed nuclear program.

Bahrain, which hosts the U.S. Navy’s regional headquarters, said it arrested dozens of people it alleged had links to the Revolutionary Guard. Bahrain said it arrested 41 people it said are part of a group affiliated with the Revolutionary Guard, and its interior ministry said investigations confirmed the suspects were in contact with the Guard and collected funds “with the aim of sending them to Iran” to support its “terrorist operations.”

Rights groups have previously said Bahrain has used the war between Iran and the United States as a reason to crack down on dissent. Bahrain is led by a Sunni Muslim monarchy but has a majority Shiite population, according to reporting referenced in the account.

In a separate message, an Iranian official warned Bahrain that siding with what Iran described as the U.S.-backed resolution could bring consequences. Ebrahim Azizi, head of the national security commission of Iran’s parliament, said on social media: “Siding with the U.S.-backed resolution will bring severe consequences. The Strait of Hormuz is a vital lifeline; do not risk closing it on yourselves FOREVER.”

The account also described how the wider maritime fight has unfolded amid the ceasefire. The U.S. said it imposed its own blockade of Iran’s ports and that on Saturday its forces had turned back 58 commercial ships and “disabled” four since the blockade began April 13. Iran has mostly blocked the critical waterway for global energy since the war began Feb. 28, contributing to a global spike in fuel prices and unsettling world markets, according to the reporting.

Britain said it will deploy a warship to the Middle East to join a potential mission to protect commercial ships in the Strait of Hormuz once hostilities end. Britain’s defense ministry said the HMS Dragon would “preposition” in the region and be ready to join a U.K.- and French-led security plan, and it noted that France has moved its aircraft carrier strike group into the Red Sea in preparation.

The diplomatic push to extend the ceasefire and negotiate an end to the war continued alongside the warnings. The account said U.S. President Donald Trump reiterated threats to resume full-scale bombing if Iran does not accept an agreement to reopen the strait and roll back its nuclear program, while Iran’s foreign ministry spokesperson Esmail Baghaei told state-run IRNA that the country was not paying attention to “deadlines.”

It also cited efforts by regional and international officials, including Pakistani Prime Minister Shehbaz Sharif saying his country is in contact with the U.S. and Iran “day and night” to extend the ceasefire and reach a peace deal. Russia’s foreign ministry said it, along with Saudi Arabia, was calling for diplomatic efforts to reach a “sustainable, long-term agreement” to end the war, and the account said Russian President Vladimir Putin told reporters in Moscow that taking enriched uranium from Iran to negotiate a settlement would allow “everyone to see ‘how much of it there is, and where it is located,’” and that it would be placed under IAEA control.

The account said Egypt’s and Qatar’s top diplomats reiterated that diplomacy is the sole path to a solution in a phone call readout, and it also raised speculation about Iran’s leadership following reports that the new Supreme Leader Mojtaba Khamenei has not been publicly seen since the war began. A top Iranian official said Khamenei was in “complete health” and would eventually appear in public, according to the account.