* U.S. crude earlier touched 2-1/2 year high of $113.70/bbl
* Lower North Sea supplies curb losses on Brent
* Nigerian oil exports to rise in June
* Coming Up: U.S. GDP preliminary Q1; 1230 GMT
(Updates prices, adds details)
By Emma Farge and Caroline Copley
LONDON, April 28 (Reuters) - Oil prices slipped off earlier highs on Thursday as prospects for slower growth in the world's top economy dampened sentiment, outweighing a sliding dollar and signs of lower North Sea supplies.
U.S. crude for June <CLc1> fell 11 cents to $112.65 a barrel by 1148 GMT, after earlier touching the highest in 2-1/2 years of $113.70 a barrel. Brent crude futures fell 17 cents to $124.96 a barrel.
"I think there are some concerns about how the U.S. GDP will come out for Q1. The dollar is still weak, while oil is falling, so I think it's demand driven. It's the uncertainty about the demand from the U.S.," said oil analyst Thorbjorn Bak Jensen at Global Risk Management.
Federal Reserve Chairman Ben Bernanke said on Wednesday the U.S. labour market was still in a "very, very deep hole" and opted to keep interest rates unchanged, lowering expectations for growth prospects and fuel demand.
U.S. economic growth likely braked sharply to a 2 percent annualised rate or less in the first quarter, from 3.1 percent in the last three months of 2010, data at 1230 GMT are expected to show. [
]Earlier, oil prices were boosted by news the U.S. dollar fell to a three-year low on Thursday, spurring buying for commodities among both non-dollar buyers and investors looking to switch from cash. [
]Oil trader Robert Montefusco at Sucden Financial said the market reversal was due to profit-taking ahead of a UK holiday in honour of the royal wedding of Prince William to Kate Middleton.
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Trade estimates on Thursday showing Nigerian oil exports are set to rise in June to 2.15 million barrels per day (bpd) also helped cool pressure on prices.
Earlier on Thursday, signs of lower supplies from the North Sea had boosted the Brent benchmark, after traders said at least two Forties cargoes had been cancelled and others delayed from the May loading programme. [
]Light, sweet oil sourced from the North Sea has served as a vital substitute for Libyan exports which are virtually paralysed due to conflict and international sanctions.
Oil prices are still carrying a hefty risk premium due to political unrest in the Middle East, with Ben Westmore of National Australia Bank estimating this as high as $20-$25.
Syrian security forces have killed at least 500 civilians in a crackdown of a "peaceful democratic uprising", Syrian human rights organisation Sawasiah said on Thursday. [
]On the supply front, U.S. gasoline inventories fell by 2.51 million barrels to 205.59 million barrels, the Energy Information Administration showed on Wednesday, the lowest level since August 2009 and the lowest level for April since 2007. [
]Analysts had forecast a 1.1 million-barrel draw.
(Additional reporting by Manash Goswami in Singapore; editing by Jason Neely)