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The U.S. military announced it will begin its blockade of Iranian ships over the Strait of Hormuz on Tuesday, as Iran vowed to assert its own control over the critical international waterway.

 on Tuesday at 4 p.m. ET. The military last worked to block maritime traffic to and from Iranian ports from April 13 to June 18. 

The announcement came after an intensified exchange of strikes over the weekend, testing a shaky ceasefire and threatening a return to all-out war in the region.

On Monday, the U.S. launched another wave of strikes on Iran. The U.S. military 

 it struck Iranian defense systems, missile and drone sites and maritime capabilities to "degrade Iran's ability to attack commercial shipping."

Iran's Revolutionary Guard said Tuesday that it had struck "two non-compliant" supertankers in the Strait of Hormuz, according to a statement in Iranian state media. Iran also said it launched missiles and drones against U.S. military infrastructure in Bahrain, which hosts the U.S. Navy's 5th Fleet, and U.S. military outposts in Jordan.

The United Arab Emirates' Defense Ministry said two of its tankers were targeted by Iranian cruise missiles while transiting the shipping lane of the Strait of Hormuz in Omani waters, killing one person. Bahrain authorities reported that sirens were sounded and urged citizens to head to safe places. Jordanian state media said the country's air defenses intercepted four Iranian missiles early Tuesday as they entered its airspace.

The escalation comes as the U.S. and Iran reach a halfway mark in the 60-day ceasefire agreed in June, when the two sides signed a 14-point 

 to work out the terms of a final deal and open the Strait of Hormuz.

During a NATO summit in Turkey last week, President Trump 

 "over," but didn't rule out further talks.

The truce all but collapsed over the weekend as Iran attacked a commercial vessel moving through the Strait of Hormuz on Saturday and the U.S. retaliated with strikes in response.

Iranian Foreign Minister Abbas Araghchi told a news conference Monday that Iran was in touch with mediators, including Oman, Qatar and Pakistan, saying their role was to de-escalate the situation.

But the status of negotiations with the U.S. was not clear.

Control over the Strait of Hormuz — a key shipping route for oil, gas and other goods — has emerged as the key point of contention between the U.S. and Iran. The deadlock over the waterway, through which roughly 20 percent of the world's energy supplies typically move, has disrupted global trade and increased fuel prices around the world.

This latest wave of strikes from both sides is already having an impact in traffic through the Strait of Hormuz, with Kpler, a data and analytics company that tracks global commodity and shipping markets, saying on Monday that crossings dropped to 22 ships last week — an almost 85 percent decrease from the prewar traffic.

The Strait of Hormuz is considered an international waterway, but since the start of the war on Feb. 28, Tehran has claimed it's in control and has insisted ships get permission and follow approved routes. Iran has been attacking ships if they did not comply with its orders.

Trump pushed back on Monday and said the United States would not allow Iranian ships to move through the strait. "We are reinstating THE IRANIAN BLOCKADE, so named because it is only stopping Iran's ships or customers from entering or leaving," he said in a 

Trump said other countries will be able to move through the waterway, but the U.S. will charge a 20 percent toll on cargo as reimbursement for the U.S. doing "the job of providing safety and security to this very volatile section of the World."

The U.S. will be known as "THE GUARDIAN OF THE HORMUZ STRAIT," he wrote.

Until now, the U.S. had said there should not be any tolls or fees on shipping through the strait.

CENTCOM did not mention fees but said mariners approaching the Gulf of Oman and Strait of Hormuz should "contact U.S. naval forces on bridge-to-bridge channel 16." It said, "Additional information will be provided to commercial mariners through a formal notice."

Iran's foreign minister responded to Trump's announcement, saying he was correct to note that providing safe passage should be compensated. But he 

, "Iran has always been the GUARDIAN of the Strait and will remain so FOREVER."

Araghchi then appeared to haggle with Trump: "20% is of course too much. We will be fair," he wrote.

Iranian leaders have been defiant that Iran controls the Strait of Hormuz, despite the Trump administration's claims.

Different interpretations of the memorandum of understanding

 between Iran and the United States blame the lack of details in the agreement for the confusion over the management of the strait that led to renewed fighting.

Michael Singh, a Mideast specialist and the managing director of the Washington Institute for Near East Policy, says that one such example is Paragraph 5 of the memorandum of understanding, which stipulates that Iran would make arrangements using its "best efforts for the safe passage of commercial vehicles." Singh says the Trump administration and Iranian leaders differ in their interpretation of that commitment, with Iran considering it controls the strait.

"Here, I think the wording, you know, hews much more to what Iran wanted to get out of that understanding because it seems to place responsibility for the straits in Iran's hands rather than reinforcing that this is an international waterway," Singh adds.

Prior to its announcement of the reinstatement of its blockade of Iranian ships over the Strait of Hormuz, the U.S. had urged ships to use a southern route that hugs the coast of Oman. Iran said this violated the memorandum of understanding.

Iran's Parliament speaker and negotiator with the U.S., Mohammad Bagher Ghalibaf, posted an 

 on social media, highlighting the section of Point 5 that says "Iran will make arrangements." He wrote: "The era of one-sided deals is OVER."

The foreign minister of Qatar — a mediator in the conflict — had said ceasefire talks would continue after the multiday 

funeral last week for Iranian Supreme Leader Ayatollah Ali Khamenei

. The ayatollah was killed in U.S.-Israeli airstrikes at the start of the war in late February.

NPR's Jackie Northam and Hadeel Al-Shalchi in Istanbul contributed reporting.

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The U.S. military announced it will begin its blockade of Iranian ships over the Strait of Hormuz on Tuesday, as Iran vowed to assert its own control over the critical international waterway.


The U.S. is set to reinstate a blockade over the Strait of Hormuz

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