Dow Jones Industrial Average index opened higher on Wednesday morning trade as US reported country's GDP in 4th quarter expanded more than expected. However shares erased gains later on Fed chairman Ben Bernake's announcement about persisting uncertainty in economy. Blue chip index slipped 0.41% or 53.05 points and settled at 12,952.07. On monthly basis, however, Dow index has advanced 2.5%. Hewlett Packard contributed the main downward pressure on the index, dropping 3.3% while on the upside Coca Cola added 1.5%.