Oil prices rise as US–Iran ceasefire fears mount after ship seizure

Oil prices surged by more than 5% on Monday, April 20, 2026, amid rising concerns that the fragile ceasefire between the United States and Iran could unravel following the seizure of an Iranian cargo vessel by U.S. forces.

Oil prices jumped more than 5% on Monday, April 20, 2026, on fears that the ceasefire between the ‌United States and Iran could collapse the U.S. seized an Iranian cargo ship.

Brent crude futures advanced $5.08, or 5.62%, to $95.46 a barrel by 0418 GMT, while U.S. West Texas Intermediate was ​at $88.86 a barrel, up $5.01, or 5.97%

Both contracts tumbled by 9% on Friday, their largest daily declines ​since April 18, after Iran said passage for all commercial vessels through the Strait ⁠of Hormuz was open for the remaining ceasefire period and U.S. President Donald Trump said Iran has ​agreed to never close the strait again.

A senior oil market analyst at Sparta Commodities, June Goh, said: “Within 24 hours of Friday’s ‘completely open’ announcement, there were already tankers ​that were fired upon by the Islamic Revolutionary Guard Corps (IRGC), leading to more fears from the shippers on attempting to leave.

“Market fundamentals are getting worse, as 10-11 million barrels ​per day of crude oil remains shut in.”

FG raises the alarm over fire risks from poor solar installations

The United States said on Sunday that it had seized ​an Iranian cargo ship that tried to run its blockade while Iran said it would retaliate amid growing worries of ‌a ⁠resumption of hostilities.

Iran also said it would not participate in a second round of negotiations that the U.S. had hoped to kick off before its two-week ceasefire with Iran expires this week.

The United States has maintained a blockade of Iranian ports, while Iran has lifted and then re-imposed its own blockade of the Strait, which ​handled roughly one-fifth of ​the world’s oil supply ⁠before the war began almost two months ago.

The MST Marquee’s head of research, Saul Kavonic, told Reuters: “Oil markets continue to gyrate in response to oscillating social media posts by the U.S. and Iran, rather than ​the realities on the ground which remain challenging for oil flows to resume ​in a ⁠rapid fashion.

“Ship owners will be twice shy about heading towards the Strait again without receiving much more confidence that any ⁠announced ​passage is real.”

More than 20 ships passed the strait on ​Saturday carrying oil, liquefied petroleum gas, metals and fertilizers, Kpler data showed, the highest number of vessels crossing the waterway since March ​1.