Brent, WTI hit highest levels since October on Thursday
Both contracts on track to rise more than 4 this week

SINGAPORE, April 5 Reuters 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 59 cents, or 0.7, to 91.24 a barrel by 0646 GMT. U.S. West Texas Intermediate crude was at 87.02 a barrel, up 43 cents, or 0.5.

Both benchmarks settled at their highest since October on Thursday.

Oil prices look set for further upside in the short term as a more positive economic backdrop is joined by ongoing supply tightness and rising geopolitical risks, ANZ analysts Daniel Hynes and Soni Kumari said in a note, as the bank raised its threemonth price target for Brent to 95 a barrel.

Brent and WTI are set to notch a more than 4 gain this week, climbing for a second straight week, after thirdlargest OPEC producer Iran vowed revenge against Israel for an attack that killed highranking Iranian military personnel.

Israel has not claimed responsibility for the attack on Iran39;s embassy compound in Syria on Monday.

Ongoing Ukrainian drone attacks on refineries in Russia may have disrupted more than 15 of Russian capacity, a NATO official said on Thursday, hitting the country39;s fuel output.

The Organization of the Petroleum Exporting Countries OPEC and allies led by Russia,…