The S-and-P/T-S-X composite index lost 94.41 points to 12,658.09.
Volume at 4:15 p.m. Eastern Time was 302.91 (m) million shares.
The Dow Jones industrial average fell 12.67 points to 15,294.50.
The Standard and Poor's 500 slipped 4.84 points to 1,650.51.
In the New York Mercantile Exchange, the gold futures contract for June jumped 24 dollars, 40 cents U-S to 1,391 dollars, 80 cents an ounce.
The July crude contract dipped three cents U-S to 94 dollars, 25 cents per barrel.
(The Canadian Press, The Associated Press)