Oil prices extended gains to trade near six-week highs on Wednesday as fears of further supply disruptions intensified after US forces struck Iranian military targets for the 11th straight night.
Brent crude futures rose $1.84, or 2.0%, to $92.85 a barrel at 0630 GMT, the highest since June 11. US West Texas Intermediate crude climbed $1.67, or 2%, to $86.01, its highest since June 12.
The gains came after oil settled at a five-week high on Tuesday in the wake of US forces striking targets in southern and western Iran, while Iran attacked Bahrain, Kuwait and Jordan.
The US military said it began its latest strikes on Iran late on Tuesday in the United States, or early Wednesday in Iran. The US attacks came a short while after the Kuwaiti army said its air defenses were intercepting Iranian drones on Wednesday.
The Caspian Pipeline Consortium has stopped receiving oil from Kazakhstan after suspending loadings on Monday due to attacks on oil tankers at its Black Sea terminal blamed on Ukrainian drones. Ukraine has not commented on the attacks.
"The longer the suspension drags on, the greater the likelihood that Kazakhstan will be forced to curb upstream production," said ING.
Data from the American Petroleum Institute showed that US crude and distillate inventories rose last week, while gasoline stockpiles fell, market sources said. The inventory data comes ahead of official figures from the US Energy Information Administration on Wednesday.
