us stocks turned sharply lower tuesday morning falling to fresh sixweek lows as the main benchmarks looked to add to a threeweek losing streak while treasury yields surged the sp 500 spx was down 31 points or 08 at 3893 breaking below the key 3900 level while the dow jones industrial average djia dropped 227 points or 07 to 31091 the nasdaq composite comp fell 136 points or 12 to 11493 the yield on the 10year treasury note climbed 14 basis points to 3337 its highest since june bond yields rise as prices fall