Falling risk appetite on equity markets on Wednesday resulted in some weakness in the industrial metals and mining sector.Jitters were getting the best of investors this afternoon ahead of the all-important Federal Reserve policy decision later on this evening. Markets are waiting to see whether Fed Chairman Ben Bernanke will give more clarity on when the central bank will begin to taper quantitative easing, something which was designed to boost economic growth by flooding financial markets with liquidity.Steel giant EVRAZ was among the worst performers in the industrial metals sector, along with nickel producer Tavlivaara and iron ore group Ferrexpo.Also dampening sentiment today in the mining sector was the news that HSBC has cut its growth estimates for China for this year and the next, saying that changes in reforms would be negative for demand in the short term.China, one of the world's largest consumers of metals, is expected to grow by just 7.4% in 2013, according to HSBC's new forecasts. This is down from its earlier estimate of 8.2% and much lower than the 7.8% consensus forecast. China will then expand by 7.4% in 2014, down from its earlier 8.4% estimate (consensus: +7.8%), the bank predicts.The bank said that growth will slow before regaining momentum in 2015. "Once implemented, these measures should invigorate the private sector and improve efficiency, lifting growth prospects in the medium to long term."Top performing sectors so far todayFood & Drug Retailers 4,383.58 +1.56%Beverages 14,407.05 +1.07%Aerospace and Defence 5,027.53 +0.58%Software & Computer Services 1,075.72 +0.43%Technology Hardware & Equipment 1,013.52 +0.28%Bottom performing sectors so far todayIndustrial Metals & Mining 1,330.62 -2.17%Fixed Line Telecommunications 3,586.66 -2.14%Life Insurance 5,758.03 -1.16%Mobile Telecommunications 4,259.18 -1.05%Financial Services 6,556.00 -0.97%