Oil prices extended gains on Tuesday as risks of a prolonged conflict in the Middle East grew after Iran threatened to retaliate against any new U.S. attacks on its assets, heightening worries over supply disruption.
Brent crude futures climbed 34 cents, or 0.35%, to $97.34 a barrel by 0000 GMT. U.S. West Texas Intermediate crude was at $92.63 a barrel, up $1.15, or 1.26%.