Futures slightly lower a day after Brussels attacks

(Reuters) - Stock futures pointed to a slightly lower opening for Canada's main stock index on Wednesday as investors remained cautious after the deadly attacks in Brussels. June futures on the S&P TSX index were down 0.13 percent at 7:15 a.m. ET. No major economic events are scheduled for the day. Canada's main stock index ended lower on Tuesday, with losses in financial, industrial and materials stocks partially offset by gains for energy companies and utilities. Dow Jones Industrial Avera