Stocks swoon anew amid Fed, emerging market angst

Downward pressure on U.S. stocks returned Wednesday as Wall Street weighed the impact of Turkey and South Africa's moves to hike interest rates in an effort to stem emerging market turmoil, and investors looked ahead to the Federal Reserve's policy decision later today.

Wall Street expects the Fed to continue to further reduce its stimulus for the U.S. economy when it wraps up its two-day meeting, despite a hiccup in job growth in December and recent market turbulence cente