Hong Kong stocks hit 13-year low as Alibaba, Tencent pressure index near 16,000-mark, yuan slumps on China growth worries, Fed rate outlook The Hang Seng Index slumps to the lowest level since April 2009 as tech losses put the 16,000 threshold under pressure The offshore yuan depreciates to the weakest level since August 2010 on slowdown concerns, Fed tightening bias