The S&P/TSX composite index fell 66.82 points, or 0.54%, to 12,268.86.

The benchmark index finished the week 233.29 points higher.

All 10 TSX main sub-groups were down, with information technology taking the deepest tumble, dropping 2.56%.

Tech firm Celestica Inc. lost $1.71, or 13.03%, to $11.41 after releasing disappointing quarterly earnings.

Research in Motion Inc. lost $2.31, or 1.75%, to $129.93.

The energy sector lost 0.58%, even though oil prices moved somewhat higher after worries surfaced of a terrorist attacks on oil sites in the Middle East.

Light, sweet crude for December delivery climbed 39¢ to close at US$60.75 a barrel.

Western Oil Sands Inc. gave up 17¢, or 0.59%, to $28.68.

The materials index gave up 0.17%, while the gold sub-index lost 0.53%. The December contract for gold moved up $1.20 at US$601.

Iamgold Corp. lost 18¢, or 1.87%, to $9.46.

The S&P/TSX Venture composite index gained 11.18, or 0.44%, to 2,540.43.

The Canadian dollar was up 0.31 of a cent to US89.37¢.

In New York, markets ended the week lower, breaking a run of positive gains, on negative economic reports and disappointing corporate earnings news.

The Dow Jones industrial average lost 73.40 points, or 0.60%, to 12,090.26, the S&P 500 dropped 11.74, or 0.85%, to 1,377.34, and the tech-heavy Nasdaq composite index gave up 28.48 points, or 1.20%, to 2,350.62.

For the week, the Dow gained 0.8%, the S&P 500 lifted 0.7% and the Nasdaq advanced 0.4%.