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TORONTO, May 3 (Reuters) - Toronto's main stock index fell to a near one-week low on Tuesday morning, driven down by weakening commodity-linked shares as prices for oil and copper dropped.
The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE fell 139.21 points, or 1 percent, to 13,795.30. All of the index's 10 main groups were lower, with both the heavyweight energy and materials groups shedding more than 1.5 percent. (Reporting by Ka Yan Ng; editing by Peter Galloway)