U.S. oil jumps above $75 a barrel after Trump reinstates Strait of Hormuz blockade on Iranian ships

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Oil prices jumped Monday after President Donald Trump said the U.S. would reimpose a naval blockade against Iran as Tehran and Washington battle to control the Strait of Hormuz.

Brent crude futures, the international benchmark, advanced 5.3% to $80 per barrel. West Texas Intermediate futures were last seen 5.3% higher at $75.18.

"We are reinstating the THE IRANIAN BLOCKADE, so named because it is only stopping Iran's ships or customers from entering or leaving. All other countries will have fair and open use of the Strait," Trump said in a post on his social media platform.

The president said the U.S. will protect traffic in Hormuz but demanded reimbursement equivalent to 20% of all cargo shipped. The decision to reimpose the blockade comes after the U.S. and Iran exchanged strikes over the weekend.

The U.S. military launched another wave of strikes Sunday against Iran after hitting 140 targets on Saturday, according to U.S. Central Command. The strikes were in response to an attack by the Islamic Revolutionary Guard Corps on a container ship transiting Hormuz.

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Iran responded Sunday with strikes on U.S. military facilities in Jordan, Kuwait, Bahrain and Oman, according to the state news agency Tasnim.

Iranian state media said the Revolutionary Guard had closed the Hormuz until further notice, but the U.S. military disputed that claim. Centcom said the strait was open to "all vessels seeking to lawfully transit."

"U.S. forces are positioned and prepared to ensure that freedom of navigation remains available despite unwarranted Iranian aggression, harassment, threats, and arbitrary declarations," Centcom said in a social media post Sunday. "Iran does not control the strait. Traffic is flowing."

Trump said Hormuz was open in an interview with NBC News' "Meet the Press" that aired Sunday. The maritime intelligence firm Windward tracked nine ships that transited the strait on Saturday.

The southern route through Oman's waters remains open to inbound and outbound traffic, said the Joint Maritime Information Center, a U.S.-led naval coalition in Bahrain that provides security updates to civilian ships transiting waters in the Middle East.

But the security situation in Hormuz remains severe, the center said in a notice on Sunday. Mariners should exercise "extreme vigilance," it said.

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The weekend airstrikes are the fourth time the U.S. has bombed Iran over the past week in retaliation for attacks on commercial ships transiting Hormuz in the southern corridor protected by the U.S. military.

Iran is demanding ships use a northern route through its territorial waters as it claims control of the strait.

The latest outbreak of fighting stems from conflicting U.S. and Iranian interpretations of how Hormuz was supposed to reopen under an interim peace deal they signed on June 17.

About 20% of the world's oil supplies transited Hormuz before the U.S. and Israel attacked Iran on Feb. 28. Traffic plunged after Iran started attacking ships in the strait in early March, but transits had picked up after Washington and Tehran signed the interim deal.