SINGAPORE: Oil prices rose during Asian trade on Thursday, extending gains from the previous session, after the killing of a Hamas leader in Iran raised the threat of a wider Middle East conflict and concern over its impact on oil. Global benchmark Brent crude futures rose 71 cents, or 0.9 percent, to $81.55 a barrel by 8:05 a.m. Saudi time, while US West Texas Intermediate crude futures gained 76 cents, or 1 percent, to $78.67 a barrel. The most active contracts on both benchmarks jumped about 4 percent in the previous session.