US STOCKS-S&P 500, Nasdaq notch biggest weekly losses since March

Wall Street see-sawed to a lower close on Friday, capping a tumultuous week during which benchmark Treasury yields hit 16-year highs and investors digested the Federal Reserve's hawkish outlook revisions. On Thursday, the S&P 500 dipped below its 100-day moving average – a key support level – for the first time since March, Its failure to break above that level suggests the index is still under downward pressure.