Toronto stock turns negative as materials weigh
TORONTO, Sept 23 (Reuters) - The Toronto Stock Exchange's main index turned negative after rising more than 100 points near the open on Tuesday, pulled down by a slump in materials stocks on sagging base metals prices.
At midmorning, the S&P/TSX composite index .GSPTSE was down 2.25 points at 12,635.82. (Reporting by Jennifer Kwan; Editing by Peter Galloway)
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