Wall Street gained as the US Federal Reserve is expected to announce an interest rate increase and provide updated economic and rate forecasts.
In 12:16 pm trading in New York, the Dow Jones Industrial Average climbed 0.5 percent, while the Nasdaq Composite Index gained 0.3 percent. In 12.01pm trading, the Standard & Poor's 500 Index rose 0.4 percent.
US Treasuries slipped, bolstering the yield on the 10-year note one basis point to 2.9 percent. The greenback also weakened.
The Federal Open Market Committee's post-meeting statement and forecasts, as well as the press conference by Chair Jerome Powell, will be scrutinised for clues whether the central bank's pace of hikes this year might accelerate from the three it has so far flagged.
"Whether we have three or four rate hikes this year shouldn't be that big of a difference to the economy, but it will have a big impact on market prices and market psychology," Chris Zaccarelli, chief investment officer of the Independent Advisor Alliance, told Bloomberg.