SINGAPORE: Oil prices extended gains on Wednesday as fears of further supply disruptions intensified after US forces struck Iranian military targets for the 11th straight night, while oil tankers made U-turns ​in the Red Sea after warnings by Iran-backed Houthi militia.

Brent crude futures rose $1, or ‌1.1 percent, to $92.01 a barrel at 06:30 a.m. Saudi time. US West Texas Intermediate crude climbed 82 cents, or 1 percent, to $85.16.

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 US facilities in Bahrain, Kuwait and Jordan.

The US military said it ​began its latest strikes on Iran late on Tuesday in the US, or ⁠early Wednesday in Iran. The US attacks came a short while after the Kuwaiti army said its ​air defences were intercepting Iranian drones on Wednesday.

The constant trading of strikes have raised fears of further disruptions ​to global energy supplies after Yemen's Iran-aligned Houthis opened a new front in the Iran war by threatening to target vessels carrying Saudi oil in the Bab el-Mandeb Strait and announcing a naval blockade of Saudi Arabia.