Dow Jones Industrial Average index fell sharply on Tuesday amid uncertainty about 1st quarter earning reports and worries the Spanish yields are approaching critical level. Blue chip index lost 1.65% or 213.66 points and finished at 12,715.93 with 29 of 30 shares closing lower. Alcoa, the US largest aluminium manufacturer dropped 2.9% before its earnings report. However, the company surged 5.4% in after hours trade as its results topped all pessimistic projections.