Wall St extends selloff as oil prices fall further

By Caroline Valetkevitch NEW YORK (Reuters) - U.S. stocks were down more than 1 percent in afternoon trading on Tuesday, extending recent losses as data showed the pace of growth in the U.S. service sector had slowed and oil prices fell further. Data on Tuesday pointed to slowing growth in the fourth quarter. The pace of expansion in services moderated in December and new orders for manufactured goods fell for a fourth consecutive month in November. The S&P 500 fell below the 2,000 level for