Brent crude climbed $3.15 to $91.25 a barrel as of 1403 PKT; US WTI crude up $2.96 to $86.36
The sun sets behind oil pumps outside Vaudoy-en-Brie, near Paris, France, March 18, 2026—REUTERS
Oil prices rose more than 3.5% on Monday after the US attacked an Iranian island in the Strait of Hormuz and Tehran said it had retaliated, as their conflict extended into its sixth month.
Brent crude futures were up $3.15, or 3.58%, to $91.25 a barrel at 0903 GMT, while US West Texas Intermediate crude was up $2.96, or 3.55%, to $86.36.
Read: Oil on track for weekly loss even as Iran tensions simmer
US forces struck two launchers on Iran’s Larak Island in the Strait of Hormuz on Sunday, the first known American strikes on the country since late July.
In response, Iran attacked two US air bases in Jordan, Iranian media reported on Monday, citing Iran’s Revolutionary Guards.
“Renewed military strikes in the Middle East and concerns of further oil supply disruptions have lifted oil prices,” said UBS analyst Giovanni Staunovo, adding that markets will now focus on whether the situation de-escalates or not.
US President Donald Trump said in a social media post on Sunday that Iran’s energy hub of Kharg Island was being “blown to smithereens”, but there was no evidence the island was under attack. The post, which included an AI-generated video, provided no further details. Iran denied any attack on the island and said oil operations were continuing.
Efforts to negotiate an end to the conflict remain stalled as mediators seek to reopen the Strait of Hormuz, through which a fifth of global oil supplies passed before the war began at the end of February.
Part of the sharp market reaction reflected thin trading volumes due to a UK public holiday, said Saxo Bank analyst Ole Hansen.
Shipping data showed the number of visible commodity vessels transiting the strait over the weekend fell to five a day, highlighting caution among operators concerned about attacks on shipping.
The United Kingdom Maritime Trade Operations agency said on Sunday that a tanker had been struck by a projectile while entering the strait on Saturday.
US Treasury Secretary Scott Bessent told Reuters on Sunday that the US was likely to impose new secondary sanctions on Iran every week.
Despite Monday’s rally, Brent and WTI were still on track to post modest losses for August after falling more than 4% last week, their first weekly declines in three weeks.
Trump also said on Sunday that oil secured under a recently struck deal with Venezuela would be used to replenish the US Strategic Petroleum Reserve, which has fallen to near its lowest level in 44 years.
