Hong Kong's Hang Seng index followed its American counterparts on Tuesday and climbed sharply on Federal Reserve news. Hang Seng index surged 1.83% or 378.05 points and finished at 21,046.91. Commodities supported the index on the upside with Aluminum Corp. of China gaining 4.1% and Jiangxi Copper advancing 3.8%. China Life Insurance rallied 2.7% despite reporting a 45% fall in profit for 2011. HSBC Holdings added 2.3% and China Construction Bank edged up 2.5%.