U.S. stocks extended declines in choppy trade on Tuesday as shares of chip makers weighed, while worries over Europe's debt problems resumed.

Additionally, new rules to curb stock trading when markets plunge uncontrollably were expected to be proposed later in the day. Sources said exchanges are expected to introduce such circuit breakers for large U.S. stocks over a six-month pilot program.

The Dow Jones industrial average <.DJI> slipped 13.46 points, or 0.13 percent, to 10,612.37. The Standard & Poor's 500 Index <.SPX> was off 3.83 points, or 0.34 percent, to 1,133.11. The Nasdaq Composite Index <.IXIC> gave up 17.80 points, or 0.76 percent, at 2,336.43.

(Reporting by Leah Schnurr)

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