Mumbai, May 8 -- COMEX gold futures fell to hold above $3400 per ounce. The metal climbed by over half a percent on Thursday morning in Asia but tanked heavily thereafter. It currently trades at $3340 per ounce, down 1.50% on the day. The US dollar index has edged up above 99 mark and is currently trading at 99.96, up half a percent on the day and hitting one week high. Dollar has edged up after the Federal Reserve held its key interest rate unchanged in a range between 4.25%-4.5% at the end of a two-day monetary policy meeting on Wednesday and stated that the uncertainty about the economic outlook has increased further. MCX Gold tanked too, giving up heavily after falling into red in early moves. It currently trades down 1.20% at Rs 95906 ...