SINGAPORE: Oil prices extended gains on Friday and headed for a second weekly gain, supported by geopolitical tensions in Europe and the Middle East, concerns over tightening supply, and optimism about global fuel demand growth as economies improve.
Brent crude climbed 40 cents, or 0.4%, to $91.05 a barrel by 0425 GMT. U.S. West Texas Intermediate crude was at $86.82 a barrel, up 23 cents, or 0.3%.
