By Wallace Witkowski and Mark DeCambre, MarketWatch

U.S. stocks moved sharply higher and kept testing new intraday highs Monday, buoyed by remarks from one Federal Reserve official suggesting a September interest-rate hike may not be a done deal as well as a bounce-back in Chinese stocks.

The main U.S. indexes have been weighed by worries about the prospect a slowdown in Asia as well as impending tightening of U.S. monetary policy.

But comments from Federal Reserve Vice Chairman Stanley Fischer on Monday may have helped ease some of those concerns. He told Bloomberg TV he doesn't expect the first interest-rate hike by the U.S. central bank in more than nine years to occur until after inflation returns (http://www.marketwatch.com/story/no-rate-hike-until-fed-sees-inflation-returning-to-normal-fischer-2015-08-10) closer to the Fed's target of around 2%. The inflation rate has dipped close to zero in recent months and hasn't been above 2% since April 2012 (http://www.marketwatch.com/story/feds-fischer-suggests-september-rate-hike-not-a-done-deal-2015-08-10).

Still stocks didn't waver even after Atlanta Fed president Dennis Lockhart, who last week supported a September rate hike (http://www.wsj.com/articles/atlanta-feds-lockhart-fed-is-close-to-being-ready-to-raise-short-term-rates-1438709252), said Monday the economy is strong enough can handle a gradual rise in interest rates (http://www.marketwatch.com/story/feds-lockhart-economy-can-handle-gradually-higher-interest-rates-2015-08-10).

The Dow Jones Industrial Average was up 228 points, around 1.3% higher, to 17,602. Twenty-nine out of 30 of the blue-chip index components were in positive territory, led by Apple Inc.(AAPL), up 3.5%, Caterpillar Inc.(CAT), up 3.5%, and as the Dow looked to snap a seven-session losing streak, its worst since 2011's debt ceiling crisis (http://www.marketwatch.com/story/us-stock-futures-flat-as-traders-dont-dare-to-move-before-jobs-data-2015-08-07).

The S&P 500 jumped nearly 26 points, or 1.2%, to 2,103. All of the S&P's sectors except utilities were higher. The tech-laden Nasdaq Composite Index was up 60 points, or 1.2%, at 5,104.

China's stock market jumped overnight, perhaps assuaging some concerns that the country's stock market is running out of steam.

"China has been the No. 1 concern in the market and if the market believes that China's not coming apart at the seams, then we're going to see a nice bounce," said Tobias Levkovich, chief equity strategist at Citigroup.

China's Shanghai Composite Index leapt 4.5% for its biggest one-day gain in a month (http://www.marketwatch.com/storyno-meta-for-guid) on expectations Beijing will maintain its market support.

Monday's moves mean the U.S. benchmarks could snap a seven-session losing streak.

BTIG's Dan Greenhaus said there's lots of stock picking among recent losers, as evidenced in Monday's best performing sectors, energy and materials, which are both up more than 2% on the session. For the quarter to date, those sectors have been, and remain, the worst performers on the S&P 500, with energy down 8.8%, and materials down 4.4%.

On Friday, the main indexes closed lower after the jobs report matched economists estimates, giving investors little reason to believe that a rate hike would be derailed.

"There was enough encouragement in the detail of the [jobs] report to suggest that the U.S. labor market is gradually improving. Hours worked pushed higher, and full-time employment improved, which should be enough to keep [Fed Chairwoman] Janet Yellen on track for a first Fed rate hike in September," said Rebecca O'Keeffe, head of investment at stockbroker Interactive Investor, in a note on Monday.

Read: Yellen's razzle-dazzle new indicator ignored -- even by Yellen (http://www.marketwatch.com/story/yellens-razzle-dazzle-new-indicator-ignored-even-by-yellen-2015-08-10)

Other markets: European markets were mixed, as resource firms fell after a round of downbeat data from China (http://www.marketwatch.com/story/chinas-economy-enters-second-half-of-2015-on-weak-note-2015-08-09)--a major user of raw materials.

Oil prices (http://www.marketwatch.com/storyno-meta-for-guid) rose, attempting a rebound from last week's losses (http://www.marketwatch.com/story/oil-gains-but-still-on-pace-for-hefty-weekly-drop-2015-08-07), when futures slumped 6.9% to the lowest settlement level since March. Metals prices were mostly higher, while the dollar slipped against most other major currencies.

Earnings:Dean Foods Co.(DF) shares slumped 6% after the company reported quarterly results Monday (http://www.marketwatch.com/story/dean-foods-swings-to-profit-beats-expectations-2015-08-10). The milk processor unexpectedly said late Friday that Chairman Tom C. Davis has resigned.

It gets busier after the bell, with Kraft Heinz Co.(KHC), burger chain Shake Shack Inc.(SHAK) and videogame company Take-Two Interactive Software Inc.(TTWO) on the earnings docket.

Movers & shakers:Berkshire Hathaway Inc.(BRKA) (BRKA) said it is buying Precision Castparts Corp (http://www.marketwatch.com/story/berkshire-hathaway-nears-deal-to-buy-precision-castparts-2015-08-08-12103303).(PCP), in what could be Berkshire's largest takeover ever. Precision Castparts shares were up nearly 30% in premarket trade Monday.

B-shares of Warren Buffett's investment vehicle slipped 0.1% Monday after the conglomerate late Friday reported its second-quarter profit fell to $4.01 billion (http://www.marketwatch.com/story/berkshire-hathaway-operating-income-drops-10-2015-08-07-174853111), or $2,442 per Class A share, from $6.4 billion, or $3,889 a share, a year earlier.

Read:These are Warren Buffett's 10 biggest deals (http://www.marketwatch.com/story/these-are-warren-buffetts-10-biggest-deals-2015-08-10)

Apple Inc.(AAPL) shares jumped more than 3%. The tech major is expected to host a special event in the week of Sept. 7 (http://www.marketwatch.com/story/apple-expected-to-host-iphone-apple-tv-event-on-sept-9-report-2015-08-07) to unveil its latest iPhone and Apple TV.

U.S.-listed shares of Alibaba Group Holding Ltd.(BABA) rose 1.8% after the Chinese e-commerce giant said it would invest more than 28 billion yuan ($4.63 billion) for a nearly 20% stake in Suning Commerce Group Ltd.(002024.SZ).

Also read:Warren Buffett's favorite indicator shows it's time to unload stocks, buy bonds (http://www.marketwatch.com/story/warren-buffetts-favorite-indicator-shows-its-time-to-unload-stocks-buy-bonds-2015-08-10) (http://www.marketwatch.com/story/warren-buffetts-favorite-indicator-shows-its-time-to-unload-stocks-buy-bonds-2015-08-10).

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