By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.S. stock futures dropped Friday, with investors remaining cautious ahead of the widely anticipated July jobs report and after a selloff in the prior session gave Wall Street its worst day in months.

While the nonfarm-payrolls report is the marquee event Friday, investors will also get comments from two Federal Reserve members, as well as quarterly results from Chevron and Procter & Gamble.

Futures for the Dow Jones Industrial Average (DJU4) dropped 96 points, or 0.6%, to 16,398, while those for the S&P 500 index (SPU4) fell 11 points, or 0.6%, to 1,913. Futures for the Nasdaq 100 index (NDU4) declined 25 points, or 0.6%, to 3,860.

Fresh in the mind of investors is Thursday's selloff that left the S&P 500 (SPX) down 2%, and the Dow Jones Industrial Average (DJI) down 317 points. The Dow is now lower for the year.

Triggers for the selloff included a quarterly rise in the U.S. employment cost index, on a larger-than-expected increase in wages. Higher wages could push up inflation and prompt the Federal Reserve to raise interest rates.

The rise in the ECI reading drove "a general lack of risk appetite around the market," said Richard Perry, market analyst at Hantec Markets, in emailed comments.

The Labor Department is due to release its July jobs report at 8:30 a.m. Eastern Time. Fed Chairwoman Janet Yellen "will be watching for wage growth in the payrolls report today," said Perry, noting the general estimate is for a rise of 0.2%. "If this comes in higher, then it could be the key takeaway from the report and cause more selling," said Perry.

Economists polled by MarketWatch forecast a 235,000 increase in net employment and a decline in the jobless rate to 6%, from 6.1%.

Earlier this week, the Fed said it expects the start of rate increases to come a "considerable time" after the end of its bond-buying program. Charles Plosser of the Philadelphia Fed is expected to issue a statement on his dissent of that view later Friday.

Richard Fisher, the president of the Dallas Fed and a voting member on the Fed's rate committee, is slated to appear on CNBC at 7 a.m. Eastern Time.

Other data due Friday include consumer sentiment and manufacturing activity in July, and monthly auto sales.

Quarterly results

On the earnings front, Chevron (CVX) is expected to report second-quarter earnings of $2.64 a share.

Procter & Gamble (PG) is likely to have made 91 cents a share for its fiscal fourth quarter.

Shares of Mobileye (MBLY), which makes camera-based driver-assistance systems in cars, will make their trading debut on the New York Stock Exchange. The shares late Thursday priced at $25 a share, above an expected range of $21 to $23 a share.

GoPro Inc. (GPRO) shares fell 10% in premarket trade. The camcorder maker posted better-than-expected second-quarter results late Thursday, but the shares fell, giving back some of their 30% increase since their June debut.

In Europe, stocks fell sharply. In Asia, Japan's Nikkei Average lost 0.6%.

Crude-oil futures (CLU4) lost ground, and gold futures (GCU4) advanced about $4 an ounce. The ICE U.S. Dollar index (DXY) was at 81.471, up from 81.446 on Thursday.

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