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Sunset clouds glow over pump jacks at the Airankol oil field operated by Caspiy Neft in the Atyrau region, Kazakhstan, April 21, 2026. REUTERS/Pavel Mikheyev Purchase Licensing Rights, opens new tab

July 14 (Reuters) - Oil prices rose 2% on Tuesday to their highest in four weeks, as the U.S. reimposed its naval blockade of Iran while the two countries stepped ​up attacks in the Strait of Hormuz, heightening uncertainty about energy flows.

Brent ‌crude futures climbed $1.68, or 2%, to $84.98 per barrel by 0051 GMT, while U.S. West Texas Intermediate crude rose $1.65, or 2.1%, to $79.79 a barrel. Brent crude surged 9.6% in the previous session, its biggest ​daily gain since May 2020.

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Oil prices are now at their highest since the ​two countries signed a memorandum of understanding to end the war on June ⁠17.

Two United Arab Emirates tankers were hit by two Iranian cruise missiles in the southern ​lane of the Strait of Hormuz in Omani territorial waters, the UAE Ministry of Defence ​said on Monday, killing one Indian crew member and wounding eight others.

Meanwhile, U.S. President Donald Trump told reporters that the United States had reinstated its blockade of Iranian shipping, adding that he wanted the U.S. ​to be reimbursed for protecting countries that it was helping in the Strait of ​Hormuz.

"The latest escalation, including the U.S. reinstatement of the blockade and Iranian responses, has clearly injected fresh ‌risk ⁠into the market," KCM Trade chief market analyst Tim Waterer said.

"While a full closure hasn't occurred, the competing objectives of both sides have made the supply picture highly uncertain," he added.

U.S. Central Command said it began a third consecutive night of strikes against Iran, while ​Tehran's semi-official YJC news ​agency said early ⁠on Tuesday that seven explosions were heard in the port city of Bandar Abbas and two more on Kish Island.

Elsewhere, Yemen's Houthi ​movement fired missiles at Saudi Arabia after accusing the kingdom of bombing ​an airport ⁠under its control on Monday.

"If the Houthis extend their attacks to Saudi's crude products in the Red Sea, it could put (further) uncertainties on crude flows from the region," Simon Wong, ⁠a portfolio ​manager at Gabelli Funds, said in a note.

Meanwhile, U.S. ​crude oil stockpiles were expected to have fallen last week, while gasoline and distillate stocks likely rose, a ​preliminary Reuters poll showed on Monday.

Reporting by Ishaan Arora in Bengaluru; Editing by Jamie Freed

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