TSX gains strength in volatile trading

TORONTO — The Toronto stock market gained ground in volatile trading Wednesday as oil prices rose and the U.S. central bank said it would leave its overnight interest rate unchanged. The S&P/TSX composite index added 46.45 points to end the day at 12,377.77, after rising 188 points on Tuesday. The TSX is still down nearly 1,000 points from Dec. 24 as continuing worries about the price of oil, global growth and China’s economic performance have weighed on markets.