North American markets endured one of the worst weeks of the year as heightened trade tensions between the United States and China rattled investors.

The S&P/TSX composite index closed down 105.38 points at 16,271.66.

In New York, the Dow Jones industrial average fell 98.41 points at 26,485.01. The S&P 500 index was down 21.51 points at 2,932.05, while the Nasdaq composite was down 107.05 points at 8,004.07.

The Canadian dollar traded at an average of US75.61¢, down from Thursday’s average of US75.66¢.

The September crude contract was up US$1.71 to US$55.66 per barrel, and the September natural gas contract was down US8.1¢ at US$2.12 per mmBTU.

The December gold contract was up US$25.10 at US$1,457.50 an ounce, and the September copper contract was down US9.4¢ at $2.57 a pound.