U.S. stock index futures edged higher on Wednesday ahead of the Federal Reserve's monetary policy decision, while the Israel-Iran conflict entered its sixth day, with new missile strikes launched from both sides.

Iran and Israel's air war, which began on Friday when Israel attacked Iran's nuclear facilities, has raised concerns that the conflict could create bottlenecks for oil exports from the oil-rich Middle East.

U.S. stocks are holding nearly in place on Wednesday as Wall Street waits to hear where the Federal Reserve may be taking interest rates. The S&P 500 was edging up by 0.1% in early trading. The Dow Jones Industrial Average was up 33 points,