Oil prices fell on Monday as traders took profits and geared up for this week's key OPEC meeting in Vienna.
New York's main contract, light sweet crude for delivery in July, sank 78 cents to $99.44 U.S. per barrel.
Brent North Sea crude for July weakened by 87 cents to $114.97 U.S. in late morning deals.
The market had fallen sharply on Friday after publication of dismal U.S. jobs figures for May but recovered by the end of the day for a modest loss.
The 12-nation Organization of the Petroleum Exporting Countries (OPEC) will meet Wednesday in Vienna amid growing fears that high prices could further dent faltering world economic growth and energy demand.
The IEA wants OPEC to increase output and prevent another damaging spike in prices, with seasonal demand set to strengthen in the coming months as the northern hemisphere enters summer.
So far this year, Brent oil prices have soared by about 21%, largely as a result of spreading unrest in the crude-producing Middle East and North Africa region -- and particularly in OPEC member Libya.
At the same time, downbeat global economic data has suggested that the recovery is struggling and this complicates the outlook.
The U.S. economy generated a paltry 54,000 new jobs in May, one-quarter of the pace for the previous four months, sparking fresh worries it faces an extended period of slow growth and lower oil consumption.
The oil cartel, which pumps 40% of the world's crude, has left its production target at 24.84 million barrels per day since early 2009.
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