Wall Street on track to open with losses as US government shutdown adds to uncertainty

Wall Street was veering toward losses before the opening bell Wednesday as a U.S. government shutdown went into effect just after midnight.

Futures for the S&P 500 and the Dow Jones Industrial Average were down 0.5% ahead of the open, while Nasdaq futures slid 0.6%. Markets just closed out a fifth straight winning month on Tuesday with the Dow hitting an all-time high.