NEW YORK - (AP) - Stocks are closing mostly lower after a day of whipsaw trading.The Dow Jones industrial average traded in a huge range of 400points. Investors are fearful that the debt crisis in Europe mightinfect banks there, roiling financial markets worldwide. Stocks opened higher Friday after the government said hiringpicked up in July, but the gains were erased within 25 minutes. The Dow closed up 61 points, or 0.5 percent, at 11,445. The S&P500 closed down a point, or 0.1 percent, at 1,199. The Nasdaqcomposite index closed down 24, or 0.9 percent, at 2,532. The Dow fell 513 points Thursday, the biggest loss since 2008. Three stocks fell for every one that rose on the New York StockExchange. Trading volume was heavy at 8.6 billion shares.