Wall Street little changed at open

The Dow Jones industrial average was up 8.7 points at 12,513

Wall Street opened little changed on Tuesday as concerns about global growth weighed on investor sentiment, while shares of Facebook continued their post-IPO slide.

The Dow Jones industrial average was up 8.70 points, or 0.07%, at 12,513.18. The Standard & Poor's 500 Index was up 4.94 points, or 0.38%, at 1,320.93. The Nasdaq Composite Index was up 9.29 points, or 0.33%, at 2,856.50.