US stocks opened lower on Thursday as investors nervously awaited Federal Reserve Chair Janet Yellen's take on interest rate hikes.
The Dow Jones Industrial Average was down 26.6 points, or 0.14%, at 18,454.88.
The S&P 500 was down 3.96 points, or 0.18%, at 2,171.48.
The Nasdaq Composite was down 11.85 points, or 0.23%, at 5,205.84.