SINGAPORE: Oil extended gains on Wednesday as President Donald Trump reimposed a naval blockade on all Iranian ports and Tehran launched strikes on US ​infrastructure in the region.

Brent futures climbed 99 cents, or 1.2 percent, to $85.72 a barrel at ‌07:00 a.m. Saudi time. West Texas Intermediate futures gained 64 cents, or 0.8 percent, to $79.98 a barrel.

Oil prices closed up 2 percent at a one-month high on Tuesday as attacks exacerbated a supply disruption in the Strait of Hormuz, through which ​about a fifth of the world’s oil and liquefied natural gas passed prior to the ​beginning of the US-Israeli war on Iran.

“While the physical oil market remains adequately ⁠supplied, any further escalation involving the Strait of Hormuz or additional sanctions on Iranian exports could ​quickly tighten market sentiment and add further risk premiums,” said Priyanka Sachdeva, senior market analyst at Phillip ​Nova.

Early on Wednesday, the US also began a fresh round of strikes “to continue degrading Iranian capabilities used to attack commercial shipping in the Strait of Hormuz,” the US military said.