The S&P 500 touched a fresh record high on Tuesday before closing just below the flatline as investors looked ahead to key Federal Reserve meeting. 

The broad index closed 0.1% lower at 3,036.89, snapping a four-day winning streak. Earlier in the session, however, it gained as much as 0.3% to hit an all-time high of 3,047.87. The Dow Jones Industrial Average closed 19.30 points lower, or 0.1% at 27,071.42.