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Iran Reimposes Strait of Hormuz Closure, Fires on Tankers Amid Ceasefire Tensions

Iran Reimposes Strait of Hormuz Closure, Fires on Tankers Amid Ceasefire Tensions
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Iran reimposed a closure of the Strait of Hormuz on Saturday, 18 April, just a day after declaring it “completely open” during a fragile U.S.–Iran ceasefire, firing on at least one tanker as commercial shipping all but halted through the vital waterway foxnews +1. The move came four days before the two‑week ceasefire was due to expire on 22 April, deepening uncertainty over global oil supplies and the prospects for a broader peace deal nbcnews +1.

Iran’s Islamic Revolutionary Guard Corps (IRGC) announced that any ship approaching the strait would be “targeted,” framing the step as retaliation for a continuing U.S. naval blockade on Iranian ports that Washington has enforced since 13 April foxnews +1. U.S. Central Command has ordered more than 20 ships to turn back under the blockade, while maritime authorities reported that an oil tanker and another commercial vessel were hit by gunfire or an “unknown projectile” near the strait on Saturday; crews were reported safe aljazeera +2. The closure reversed a dramatic diplomatic swing on Friday, when Iran’s foreign minister said the strait would be fully open for the rest of the ceasefire, triggering a sharp sell‑off in oil prices bbc +1.

A Chokepoint Re‑Closed: Tankers Turn Away, Trade Seizes Up

The Strait of Hormuz normally handles about one‑fifth of the world’s oil and liquefied natural gas flows; UN trade officials said daily ship transits have collapsed from roughly 130 in February to just about six in March, leaving the corridor “virtually closed” and threatening to slow global trade growth to as low as 1.5–2.5% this year [UNCTAD; 4]. Even during Friday’s brief opening, ship‑tracking data and industry footage showed tankers veering away from the entrance amid confusion over safety and the status of the U.S. blockade bbc. Major shipping associations such as BIMCO warned operators to avoid the area because of mines and attack risks, with one security chief saying “the area is not declared safe for transit at this point” bbc. Energy markets swung violently: Brent crude fell about 9% to $90.38 a barrel on Friday and U.S. benchmark WTI dropped more than 11% to $83.85 as traders briefly priced in a potential normalization of flows thewhistler.

Ceasefire on a Knife Edge as Diplomacy Scrambles to Catch Up

The renewed closure landed as Pakistan, acting as mediator, pushed to extend or broaden the two‑week U.S.–Iran ceasefire that is due to lapse on 22 April, with its army chief visiting Tehran and expected to host further talks in the coming days worldcargonews +1. Tehran’s hard‑line factions argued the U.S. blockade itself violated the truce and insisted Hormuz would remain shut until the measures are lifted, while moderates around the foreign ministry briefly signaled willingness to coordinate limited commercial passage before being overruled foxnews +2. In Washington, President Donald Trump said Iran “can’t blackmail us” over the strait and warned that attacks would resume if no agreement is reached by the deadline cnbc +1. India summoned Iran’s ambassador after two Indian‑flagged ships reported coming under fire, while the UK and allies discussed possible sanctions and other measures to pressure Tehran to reopen the waterway nbcnews +2.

The Bigger Picture

With shipping volumes through Hormuz already down about 95% and a ceasefire clock ticking, the weekend’s reversal underscored how control of a single chokepoint has become central leverage in a war whose outcomes will ripple far beyond the Gulf nbcnews. Whether negotiators can align an end to the U.S. blockade with credible security guarantees for shipping in the strait over the next four days will determine not only if the guns stay silent, but how long energy markets, trade flows and a slowing global economy remain hostage to a narrow channel of water.