TORONTO, Oct 22 (Reuters) - Canada's main stock index fell hard on Wednesday, hit by news of shootings in Ottawa and a sharp selloff in energy shares after oil prices tumbled. The Toronto Stock Exchange's S&P/TSX composite index unofficially closed down 235.64 points, or 1.62 percent, at 14,312.07. All 10 main sectors on the index were in the red. (Reporting by John Tilak; Editing by James Dalgleish)
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