Brent crude held near a nine-month high above $114 a barrel on Thursday supported by concerns about potential supply disruptions due to fighting in Iraq.
Oil prices were poised for a third day of gains following a rise of more than 4 percent last week after Islamic militants seized much of northern Iraq as Baghdad's forces there collapsed.
"The oil market remains in high alert, but is in a holding pattern at this stage awaiting further developments in Iraq," said Michael McCarthy, chief strategist at CMC Markets in Sydney.
Brent crude gained 21 cents at $114.47 a barrel at 0325 GMT, after ending 81 cents higher at $114.26 a barrel, its highest settlement since September 9 last year.
US crude for July delivery rose 44 cents to $106.41 a barrel.
The contract, which expires Friday, settled 39 cents lower in the previous session. "While US crude remains above $105.25 and Brent remains above $110.50, technically the risks remain to the upside for both contracts," said McCarthy.
Oil prices found support after the US Federal Reserve gave a positive assessment of the country's economy and committed to retaining accommodative monetary policy.
However, US crude eased on Wednesday after data from the US Energy Information Administration showed domestic crude inventories declined 579,000 barrels in the week ending June 13, much less than the drawdown of 5.7