The Dow Jones Industrial Average, which had dropped more than 400 points in the previous two sessions, surrendered an early gain to close lower by 46.84 points or 0.51% to 9,075.14. The Nasdaq Index, down more than 5% this week, clawed back 22.79 points or 1.37% to 1,690.20, roughly where it stood on the day before aircraft ploughed into the twin towers of the World Trade Centre.