TORONTO, May 11 (Reuters) - Toronto Stock Exchange S&P/TSX composite index .GSPTSE :
* Falls 176.38 points, or 0.91 percent, to 19,185.50 at open.TORONTO, May 11 (Reuters) - Toronto Stock Exchange S&P/TSX composite index .GSPTSE :
* Unofficially closes down 86.75 points, or 0.45 percent, at 19,275.13.