By Deborah Levine
NEW YORK (MarketWatch) -- Treasury prices rallied on Thursday, pushing down yields by the most in two weeks, after the Philadelphia Federal Reserve's index on manufacturing improved more than expected to 20.4 this month from 16.7. Yields on 10-year notes (UST10Y 3.51, -0.09, -2.39%) fell 7 basis points to 3.53%. Treasurys had strong support before the data after concerns about Greece's debt and other issues in Europe fueled a renewed flight to quality.
