US benchmark West Texas Intermediate for delivery in July jumped USD 1.53 compared with yesterday's close to USD 105.93 a barrel, also following a stockpiles report indicating solid US demand.
Brent crude for July rallied USD 2.16 to stand at USD 112.11 a barrel in London afternoon deals, "reflecting investors' concerns over escalating (Iraq) violence, with potential emerging evidence of distribution further threat to supply", said Dorian Lucas, an analyst at energy consultancy Inenco.
Jihadists were pushing toward Baghdad today after capturing a town to the north, as the US mulled air strikes in a bid to bolster Iraq's collapsing security forces.
Tang Hsin Jin, an analyst at traders CMC Markets, said there were fears that militants would "cause supply disruptions in the oil refinery town of Baiji".
The town, 209 kilometres north of Baghdad, is home to Iraq's biggest oil refinery.
Iraq is the second largest crude producer in the OPEC cartel after Saudi Arabia, pumping an average of about 3.5 million barrels a day according to the government.
It boasts the fifth largest proven crude oil reserves in the world.
The oil exporters' cartel opted this week to maintain its crude output ceiling, expressing confidence in the market despite global tensions keeping prices high.
OPEC, which will convene again in late November to assess the state of the market, remains happy with Brent oil prices hovering close to USD 110, benefiting producers.
