By Anora Mahmudova and Barbara Kollmeyer, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks recovered from early morning selling bout, but still finished lower on Monday, as investor confidence was hit by violent unrest in Hong Kong and a brief spike in the dollar.

Skittishness receded somewhat after better-than-expected consumer spending data, but investors kept to safe havens such as Treasurys , shunning riskier assets like stocks.

The S&P 500 (SPX) closed down 5 points, or 0.3%, to 1,977.80, with energy and materials leading the losses. The Dow Jones Industrial Average (DJI) dropped 41.93 points, or 0.3%, to 17,071.22. The Nasdaq Composite (RIXF) shed 6.34 points, or 0.1%, to 4,505.85.

10-year U.S. Treasury note rallied, pushing yields down to 2.49%, while gold added $2 to 1,217.1.

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 during the 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.

Separately, 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.

Stocks to watch: DreamWorks Animation SKG (DWA) surged 26% after The Hollywood Reporter said Japanese conglomerate SoftBank is looking to acquire the animation studio.

Athlon Energy Inc (ATHL) jumped 25% on news Encana Corp. (ECA) was planning on buying it for $5.93 billion in cash.

Shares of Ambit Biosciences Corp. (AMBI) climbed 87% to $15.34 on news Daiichi Sankyo Co. will acquire 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 0.6%.

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 eased 0.3%..

Options contracts on shares of Alibaba Group Holding Ltd.(BABA) became available on Monday. Shares fell 2% on Monday to $88.75 and are down 5.5% from the closing price on the first trading day.

Janus Capital Group Inc. (JNS) shares fell 7.5%. 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 markets slipped on the back of its protests, while 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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