By Anora Mahmudova and Barbara Kollmeyer, MarketWatch

NEW YORK (MarketWatch) -- Nervousness triggered by unrest in Hong Kong and a brief spike in the dollar pushed investors toward safe havens, while U.S. equities lost ground on Monday.

The S&P 500 (SPX) fell 10 points, or 0.5%, to 1,972.55, with energy and financials leading the losses. The Dow Jones Industrial Average (DJI) dropped 94 points, or 0.5%, to 17,021.11. The Nasdaq Composite (RIXF) shed 18 points, or 0.4%, to 4,493.10.

10-year U.S. Treasury note rallied, pushing yields down to 2.48%, while gold added $3 to 1,218.1.

At least some of the early unrest in the market stemmed from violent pro-democracy clashes in Hong Kong over the weekend and on Monday, which forced some banks and businesses to close and pushed the Hang Seng Index 1.9% lower. Meanwhile, the dollar eased after hitting its highest level in more than six years against the yen on the perception that the U.S. central bank is looking stronger than its peers around the globe.

Jeffrey D. Saut, chief investment strategist at Raymond James, wrote that the rising dollar, which has been on a bull run for the past 11 weeks, has weighed on the price of commodities and precious metals, while the S&P 500 has been stuck around the 2000 level for three months.

"The dollar is currently the most overbought it has been in decades. Watch the Dollar Index, if it makes a trading top and begins a pullback look for a rally in stocks, as well as commodities," he added. Read: Investors likely to focus on jobs data

Two big events to watch this week: "For us, this week is about two things: ECB [European Central Bank] policy and nonfarm payrolls," said Wouter Sturkenboom, a London-based investment strategist at Russell Investment, referring to Thursday's ECB meeting and Friday's payrolls. He said traders are expecting a robust payrolls growth number of around 215,000. "Anything that upsets that expectation will cause volatility, but that volatility could go either way." Read: Big rebound seen for U.S. jobs growth

Also read: Tough job ahead for the ECB in Europe's week ahead

Data: Consumer spending rebounded in August as Americans spent more on heavy-duty items such autos and less on nondurable goods like gasoline, while income increased as well.

A gauge of pending home sales fell 1% in August, pulling back from an 11-month high in July, the National Association of Realtors reported Monday.

Chicago Fed President Charles Evans appeared on CNBC and said: "I think there will be quite some time before it becomes appropriate to raise rates." Speaking at the National Association for the Business Economics meeting in Chicago, Evans said that inflation expectations may not be as strong a pull on prices as many economists seem to expect. Evans will be a voting member of the Fed policy committee in 2015.

Stocks to watch: DreamWorks Animation SKG (DWA) surged 23% after The Hollywood Reporter said Japanese conglomerate SoftBank is looking to acquire the animation studio.

Athlon Energy Inc (ATHL) jumped 24% on news Encana Corp. (ECA) will buy it for $5.93 billion in cash.

Shares of Ambit Biosciences Corp. (AMBI) climbed 85% to $15.22 on news Daiichi Sankyo Co. will buy Ambit for about $315 million in cash.

European Union regulators are expected to publish a report on Tuesday showing that the tax practices of Apple Inc. (AAPL) and Fiat SpA violated EU law, according to a report in The Wall Street Journal reported, citing sources. Apple shares fell 0.9%.

Late Friday, Yahoo! Inc. (YHOO) Chief Executive Officer Marissa Mayer said the company is reviewing a letter from activist investor Starboard Value, urging it to merge with AOL Inc.(AOL). Shares were off slightly.

Options contracts on shares of Alibaba Group Holding Ltd.(BABA) are expected to become available on Monday. Shares fell 1.8% on Monday.

Janus Capital Group Inc. (JNS) shares fell 4.6%. On Friday, Pimco founder Bill Gross said he would leave Pimco to take a job at Janus. Morgan Stanley upgraded Janus shares to equal weight on the view that more assets will follow Gross than the market expects. Read more about the day's notable stocks in Movers & Shakers.

Elsewhere, Hong Kong stumbled, the rest of Asia finished mixed. Europe stocks eased back with miners under pressure in London, partly due to China-growth worries.

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