Canada's main stock index fell on Monday, weighed by declines for the financial and materials groups, as the market reopened after an outage halted trading for several hours on Friday afternoon.

The Toronto Stock Exchange's S&P/TSX composite index unofficially closed down 61.05 points, or 0.39 per cent, at 15,607.88. Seven of the index's 10 main groups ended lower.

Wall Street fell on Monday as healthcare stocks slid and rising oil prices and a looming deadline for exemptions to U.S. steel and aluminum tariffs weighed on investor sentiment.

The Dow Jones Industrial Average fell 147.49 points, or 0.61 per cent, to 24,163.7, the S&P 500 lost 21.83 points, or 0.82 per cent, to 2,648.08 and the Nasdaq Composite dropped 53.53 points, or 0.75 per cent, to 7,066.27.