Brent gains $3.41 on Middle East supply uncertainty
Brent rose 3.2% to $109.34 and WTI hit $100.67 as Middle East supply risks and Russian diesel doubts drove buying.
Brent crude futures rose $3.41, or 3.2%, to $109.34 at 12:41pm ET (1641 GMT).
US West Texas Intermediate (WTI) climbed $2.74, or 2.8%, to $100.67, above $100 for the first time since 21 September.
Oil prices gained more than 3% and were heading for weekly gains; Brent was up 4.1% and WTI 8.6% so far this week.
Traders cited ongoing Middle East conflict risk and doubts over how much diesel Russia can deliver, plus a surge in attacks around the Strait of Hormuz over the past 10 days.