TSX falls to three-week low as energy shares track oil lower

By Fergal Smith TORONTO (Reuters) - Canada's main stock index fell on Thursday to a three-week low as weaker oil prices sparked a sell-off in energy shares, but the financials and materials groups gained ground. The Toronto Stock Exchange's S&P/TSX composite index fell 11.3 points, or 0.08 percent, to 14,583.42, its lowest close since Oct. 11. Canadian shares were buffeted as Wall Street stocks extended recent losses. The S&P 500 fell for the eighth straight session. "It is tough for Can