NEW YORK (AP) — Jarring swings keep rocking Wall Street, and U.S. stocks erased a big morning gain to turn lower Thursday as the market remains skittish following weeks of doubts and erratic moves.

After initially soaring toward what seemed like its best day since May, with an early surge of 1.9%, the S&P 500 erased it all and dropped as much as 1.1%. It was down 0.9%, as of 1 p.m. Eastern time. The Dow Jones Industrial Average fell 290 points, or 0.6%, and the Nasdaq composite sank 1.1%.

The sharpest losses came again from what used to be the market’s biggest winners. Nvidia, cryptocurrencies and other areas that had soared with nearly relentless momentum, as traders feared missing out on more gains, forced the market lower. Bitcoin briefly fell below $87,000, down from nearly $125,000 last month.

The market had been shaky coming into Thursday, largely because of twin worries: Nvidia and other superstar stocks caught up in the frenzy around artificial-intelligence technology may have simply shot too high, and the Federal Reserve may be done delivering the invigorating cuts to interest rates that Wall Street loves.

Nvidia initially appeared to tamp down the worries about a bubble for AI stocks after reporting a big profit for the summer, along with a forecast for coming revenue that easily cleared analysts’ expectations. By delivering strong profits and indicating more are coming, Nvidia can justify its stock’s price gains and make it look less expensive.

Given Nvidia’s forecasts, “it is very hard to see how this stock does not keep moving higher from here,” according to analysts at UBS led by Timothy Arcuri. They also said “the AI infrastructure tide is still rising so fast that all boats will be lifted.”

Nvidia jumped to an early gain of 5% but then dropped to a loss of 1.5%. Because it’s the biggest company in the U.S. market by value, Nvidia’s stock has more pull on the S&P 500 than any other company’s.

Worries about a potential AI bubble aren’t gone. The concern among investors is that all the dollars pouring into AI chips and data centers may not ultimately produce the big profits and productivity for the economy that proponents have been promising.

Yes, Nvidia expects to sell another $65 billion of chips in the coming three months, which is more than analysts expected. But will all those chips create much bigger profits for Amazon and other companies using them? They still need to prove all the investment is worth it.

The most recent survey of global fund managers by Bank of America showed a record percentage of investors saying companies are “overinvesting.” That helped make a potential AI bubble the No. 1 risk that they saw for the market, one with a lower probability of happening but a chance of very big damage.

Amazon went from an early gain of 2.1% Thursday to a loss of 1.7%. Palantir Technologies swung from a jump of 5.5% to a loss of 4.6%.

Some of the market’s sharpest losses hit companies within the crypto industry, as bitcoin tumbled to its lowest price since April. Robinhood Markets dropped 8.4%, and Coinbase Global sank 6.9%

For the second worry that’s been dogging Wall Street, interest rates, Thursday’s jobs report from the U.S. government offered some relief.

Financial markets initially seemed to pick the data apart for encouraging signals, according to Seema Shah, chief global strategist at Principal Asset Management. The report showed hiring by U.S. employers was stronger in September than economists expected, which may suggest the economy remains solid. But it also said the unemployment rate worsened slightly, which could give the Fed reason to cut its main interest rate at its next meeting in December.

Traders still see a December rate cut as relatively unlikely, giving it a roughly 41% probability, according to data from CME Group. But that’s better than the 30% chance they saw a day earlier, before the September jobs report.

What the Fed does is critical for the stock market because prices ran to records in part because of expectations for continued cuts to rates. The Fed has already cut rates twice this year to shore up the slowing job market. But lower rates can also worsen inflation, which has stubbornly remained above the Fed’s 2% target.

On the winning side of Wall Street was Walmart, which rallied 5.7% after the retailer delivered another standout quarter. It reported strong sales and profits that blew past Wall Street expectations as it continues to lure cash-strapped Americans nervous about the economy and prices.

In the bond market, the yield on the 10-year Treasury eased to 4.09% from 4.13% late Wednesday.

In stock markets abroad, indexes rose across much of Europe and Asia.

Japan’s Nikkei 225 jumped 2.6%, and South Korea’s Kospi rose 1.9% for two of the bigger gains.

___

AP Writers Teresa Cerojano and Matt Ott contributed.

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