TORONTO, Sept 3 (Reuters) - The Toronto Stock Exchange's main index slumped for a second day in a row on Wednesday, dragged down by resource issues, which were hit by concerns about falling demand for commodities.

The S&P/TSX composite index <.GSPTSE> unofficially closed down 163.23 points, or 1.23 percent, at 13,136.31. (Reporting by Leah Schnurr; editing by Rob Wilson) (([email protected]; +1 416 941 8056; Reuters Messaging: [email protected]))

Keywords: MARKETS CANADA STOCKS