Dow Jones Industrial Average index declined on Thursday amid weaker Philadelphia manufacturing index and persisting concerns about Spain. Blue chip index shed 0.53% or 68.65 points and closed at 12,964.10 with 27 of 30 companies posting losses. On the upside The Travelers surged 3.8% after a strong earnings report. Alcoa and DuPont Co. each dropped 1.2%, as traders sold stocks of firms closely linked to economic expansion.