The Korean currency gained against the U.S. dollar for a second consecutive session Wednesday, as investors awaited the outcome of the Federal Reserve's rate-setting meeting amid the ongoing Middle East crisis. The won opened at 1,487 per dollar, up 6.6 won from the previous session. The currency had fallen to its weakest level since March 10, 2009, on Monday amid escalating tensions in the Middle East, briefly touching the psychologically and technically critical 1,500-won threshold for the first time in 17 years, but later rebounded Tuesday following a decline in global oil prices. Overnight, the U.S. Dollar Index, which measures the dollar's strength against a basket of six major currencies, stood at 99.540, extending its decline for the third consecutive day. It had risen as high as 100.537 on Friday. The Fed is scheduled to announce its policy decision Wednesday (U.S. time), and the focus is on how it will respond to the ongoing crisis. It is widely expected to hold rates steady. Korea's foreign exchange and stock markets have shown heightened volatility since the beginning of this m