* Mood turns as oil prices fail to extend gains
* Yen strengthens on safe haven appeal
* CPI data raises possibility of rate hike this year (Adds open of U.S. markets, byline, dateline; previous LONDON)
By Chuck Mikolajczak
NEW YORK, Feb 19 (Reuters) - Global equity markets stumbled on Friday as oil prices retreated from strong gains earlier in the week, while U.S. bond prices rose as economic data raised the possibility of an interest rate hike by the Federal Reserve this year.
Brent futures LCOc1 slumped 3.7 percent to $33.03 a barrel while U.S. crude CLc1 was down 4.7 percent at $29.32. Advances earlier in the week sparked by moves by oil producers, including Saudi Arabia and Russia, to cap output were erased after a record buildup in U.S. crude stockpiles kindled worries over persisting global oversupply. is now down 1.3 percent for the week, while WTI crude is off 0.5 percent.
"There is still a perception there is a supply issue, there is still a perception there is a demand issue," said Brian Nick, head of tactical asset allocation for UBS Wealth Management Americas in New York.
"Until you start to see less skittishness about the global economy, oil is going to get hit from both sides of the equation."
The weakness in oil prices bled over into U.S. stocks, with the S&P energy index .SPNY shedding more than 2 percent as the worst performer of the 10 major S&P indexes.
The Dow Jones industrial average .DJI fell 90.88 points, or 0.55 percent, to 16,322.55, the S&P 500 .SPX lost 9.02 points, or 0.47 percent, to 1,908.81 and the Nasdaq Composite .IXIC dropped 3.16 points, or 0.07 percent, to 4,484.38.
The S&P 500 has gained 2.8 percent for the week, putting it on pace for its best weekly performance of the year.
The pan-European FTSEurofirst 300 .FTEU3 index of leading shares was down 1.4 percent on the day, weighed by weakness in oil, bank and auto shares, but was still up nearly 4 percent for the week. Labor Department data showed the consumer price index, excluding the volatile food and energy components, increased 0.3 percent last month, in a sign of a pick-up in price pressures that could allow the Federal Reserve to gradually raise interest rates this year. perceived as safe havens did well, as benchmark 10-year Treasuries US10YT=RR were up 7/32 in price to yield 1.738 percent while yields on shorter-dated U.S. Treasury debt rose after the CPI data, with two-year Treasury notes down 2/32 in price to yield 0.7378 percent. yen rose JPY= 0.49 percent against the dollar to $112.68, and the greenback .DXY dipped 0.17 percent against a basket of major currencies. index of world shares .MIWD00000PUS was 0.68 percent lower, but was up 3.3 percent for the week, putting it on pace for its best week since October.
The weekly jump came after gains in oil eased some of the deflation concerns in the developed world earlier in the week.
The global oil market is oversupplied by around 1.8 million barrels per day (bpd), but that glut could be halved if a deal to freeze oil production at last month's levels takes effect, a top Russian energy official said on Friday. gold XAU= was down 0.6 percent at $1,229.93 an ounce as expectations that rock-bottom interest rates will persist served to keep prices above $1,225 an ounce. (Editing by Bernadette Baum)