(Adds close of U.S. markets)
By Herbert Lash
NEW YORK, May 9 (Reuters) - Oil's relentless surge to a fresh high on Friday stoked worries about the economy and pressured stock markets in the United States and Europe, while a $7.8 billion loss at AIG, the world's largest insurer, rekindled fears that the credit crisis is not over.
Oil rose to over $126 a barrel, extending gains to more than 11 percent since the start of May and fueling fears that the high prices will spark inflation throughout the global economy. Oil set a record high every day this week.
Banking shares led stock markets lower in both the United States and Europe after U.S. insurer American International Group <AIG.N> reported its record quarterly loss late on Thursday.
AIG wrote down assets linked to subprime mortgages and also said it would raise $12.5 billion in new capital to strengthen its balance sheet.
News on Friday that Citigroup <C.N>, the top U.S. bank, plans to shed $400 billion in assets also pressured the financial sector.
"Over the past weeks, investors got the feeling that the credit crisis was easing, but a piece of news like that is sort of a wake-up call that reminds us that the storm is far from over," said Marie-Pierre Peillon, head of equity and credit research at Groupama Asset Management in Paris.
"This Citigroup move might just be the beginning."
Paul Nolte, director of investments at Hinsdale Associates in Hinsdale, Illinois, voiced a similar sentiment: "Many more financial institutions will be needing to raise capital to shore up balance sheets."
The Dow Jones industrial average <
> fell 120.90 points, or 0.94 percent, at 12,745.88. The Standard & Poor's 500 Index <.SPX> declined 9.40 points, or 0.67 percent, at 1,388.28. The Nasdaq Composite Index < > fell 5.72 points, or 0.23 percent, at 2,445.52.For the week, the Dow fell 2.4 percent, the S&P 500 dropped 1.8 percent and the Nasdaq fell 1.3 percent.
Shares of AIG fell 8.8 percent to $40.28 on Friday, while Citigroup lost 2.8 percent to $23.63. Citigroup was the second most actively traded share on the New York Stock Exchange, and AIG was the third.
Despite the higher crude oil prices, Exxon Mobil <XOM.N> was among the top drags on the S&P 500 and Dow, with its shares down 0.8 percent at $88.82. Analysts said investors may be locking in profits after strong gains in recent weeks. In addition, others said that when energy prices reach a certain level it becomes more difficult for energy companies to pass on their higher costs to consumers.
In Europe, shares fell and capped their first weekly loss in a month on renewed concern over the outlook for the financial sector and the drag from the record high oil.
The FTSEurofirst 300 index <
> of top European shares fell 1.3 percent to close at 1,342.68 points. Declining shares outnumbered advancers by about five to one.The DJ Stoxx index of European banks <.SX7P> fell 1.7 percent, bringing this week's decline to 3.7 percent.
Societe Generale <SOGN.PA>, BNP Paribas <BNPP.PA> and Barclays <BARC.L> each lost between 2 percent and 2.5 percent.
French drugmaker Sanofi-Aventis <SASY.PA> was the biggest individual negative weight after the threat of generic competition for its blockbuster blood-thinner Plavix surfaced in Europe. Sanofi shares fell nearly 6 percent.
WORRIES BOOST GOVERNMENT DEBT
The renewed credit worries, prompted by the loss at AIG, boosted the appeal of safe-haven government debt on both sides of the Atlantic. The sagging stock markets helped bolster low-yielding currencies such as the yen and led the dollar to fall against most currencies on a rise in risk aversion and heightened concern about the health of the U.S. economy.
Benchmark 10-year U.S. Treasury notes posted their best week in nearly two months while the yield on 10-year Bunds fell to their lowest in three weeks to below the key psychological 4 percent level.
"The rise in risk aversion is mostly AIG," said Ron Simpson, director of FX research at Action Economics in Tampa, Florida. "It's brought credit market nervousness back."
French industrial production fell 0.8 percent in March from the previous month, a sharper drop than expected, according to data which highlighted slowing growth in the euro zone.
"You get the feeling from the corporate sector that the international credit crisis is taking its toll and this will change the entire landscape of earnings forecasts, which for the time being are still quite upbeat," said Heino Ruland, a strategist for FrankfurtFinanz.
In commodities markets, U.S. crude <CLc1> settled up $2.27 at $125.96 a barrel before rising to a record $126.25 in late post-settlement trade. London Brent crude <LCOc1> gained $2.56 to settle at $124.40 a barrel, off the earlier high of $125.90.
"Lingering geopolitical fears and high heating oil prices are helping the market, but the speed of the rise is too fast," said Tatsuo Kageyama, an analyst at Kanetsu Asset Management in Tokyo.
The dollar fell against major currencies, with the U.S. Dollar Index <.DXY> down 0.57 percent at 73.048.
The euro <EUR=> rose 0.47 percent at $1.5478, and against the yen, the dollar <JPY=> fell 0.72 percent at 102.98.
U.S. Treasury debt prices rose.
U.S. Treasury debt prices were mixed, with longer-dated securities rising and short-maturity notes falling.
The benchmark 10-year U.S. Treasury note <US10YT=RR> rose 1/32 to yield 3.78 percent. The 2-year U.S. Treasury note <US2YT=RR> fell 2/32 to yield 2.25 percent. The 30-year U.S. Treasury bond <US30YT=RR> gained 8/32 to yield at 4.53.
Gold also finished up on the back of record crude oil, as the surge boosted gold's appeal as a hedge against inflation.
Gold has traded in lock-step with movement in the energy market, which it has dramatically underperformed.
The June contract <GCM8> for gold in New York settled up 3.70 at $885.80 an ounce.
Resurgent oil surge weighed on Asian shares and earnings worries highlighted by Toyota comments pressured Japanese exporters, sending Tokyo's Nikkei average <
> down 2 percent.Shares across the rest of Asia <.MIAPJ0000PUS> fell 0.5 percent. (Reported by Jennifer Coogan, Richard Leong, Nick Olivari in New York and Amanda Cooper, Atul Prakash, Santosh Menon and Kirsten Donovan in London; Editing by Leslie Adler)