TORONTO - North American stock markets closed lower Friday as traders reacted to worrisome economic news from overseas.

The S&P/TSX composite lost 26.22 points to 15,360.55, adding to a 64-point decline Thursday.

The loonie also pulled back after a six-day run-up, down 0.32 of a U.S. cent at 81.78 cents.

South of the border, anxieties over possible Greek insolvency and regulatory changes in China pushed markets lower.

The Dow was down 279.47 points at 17,826.30, the Nasdaq fell 75.98 points to 4,931.81 and the S&P 500 lost 23.81 points to 2,081.18.

On the commodity markets, the May crude contract lost $0.97 to US$55.74 a barrel, while June gold advanced $5.10 to US$1,203.10 an ounce..