By Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Shares of Apple and Google lead a tech sector retreat as the Nasdaq Composite Index slipped back below 4,000.

Apple (AAPL) shed 1.3%, while Google (GOOG) was down 1.4% and Facebook (FB) gave up 2.6%. Shares of Yahoo (YHOO) were also in the red, down a fraction ahead of the Web portal's earnings report due after the closing bell.

Intel (INTC) was down 0.4%. The chipmaker was also scheduled to report after the market closes on Tuesday.

Shares of Cisco Systems (CSCO) and IBM (IBM) each gave up about 1%, joining the top decliners on the Dow Jones Industrial Average (DJI) which was down 26 points.

The Nasdaq Composite Index (RIXF) fell 35 points, or 1%, to 3,989. The Morgan Stanley High Tech 35 Index (MSH) and the Philadelphia Semiconductor Index (SOX) were each down nearly 1%.

On the upside, shares of Microsoft Corp (MSFT) and Twitter (TWTR) were each up a fraction.

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