Oil prices gained on Tuesday as the resumption of fighting between the U.S. and Iran in the Middle East renewed fears of supply disruptions from the world's key crude-producing region.
Brent crude futures were up 56 cents, or 0.6%, to $91.05 a barrel at 0044 GMT, while U.S. West Texas Intermediate crude was up 83 cents, or 1%, to $86.59.
