Federal Reserve leaves open timing for rate rise

The Federal Reserve left open its timeframe for a rise in ultra-low interest rates Wednesday, following a winter slowdown that stalled US economic growth. After a two-day meeting, the policy-setting Federal Open Market Committee said that it believed the first-quarter slump reflected "in part" transitory factors, and that the economy should resume expanding at a "moderate pace". The decision left uncertain the path toward a slow series of rate rises that are likely to shift g