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U.S. stocks are tumbling Monday after China raised import duties on U.S. pork, apples and other products. It’s too soon to call it the beginning of a trade war, but for now, investors aren’t sticking around to find out.

Formerly high-flying technology companies like Microsoft and Alphabet fell. Intel dove 5.7 per cent following a report in Bloomberg News that Apple plans to start using its own chips in Mac computers as early as 2020, replacing Intel.

WATCH: Markets fall after Trump places tariffs on China

0:57 Markets fall after Trump places tariffs on China Markets fall after Trump places tariffs on China

Elsewhere, Amazon sank following more broadsides from President Donald Trump on Twitter, and electric car marker Tesla gave back 4.4 per cent after saying the vehicle in a fatal crash last week in California was operating on Autopilot mode, making it the latest accident to involve a semi-autonomous vehicle.

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Major indexes were off their worst levels of the day in late afternoon trading. The Standard & Poor’s 500 index was down 67 points, or 2.6 per cent, to 2,572 as of 3:19 p.m. Eastern time. The benchmark index is on track for its lowest close since late October.

The Dow Jones industrial average lost 584 points, or 2.4 per cent, to 23,520. It was down as much as 758 earlier.

The Nasdaq composite slumped 211 points, or 3 per cent, to 6,852. The Russell 2000 index of smaller-company stocks fell 38 points, or 2.5 per cent, to 1,491.

The Toronto Stock Exchange’s S&P/TSX composite closed down 153.84 points at 15,213.45, led by declines in energy and health care.

READ MORE: China slaps fresh tariffs on American meat, fruit as retaliation for Trump import taxes

Kate Warne, an investment strategist for Edward Jones, said the step by China is small but significant.

“The fact that a country has actually raised tariffs in retaliation is an important step in the wrong direction,” she said. “The tariffs imposed by China today lead to greater worries that we will see escalating tariffs and the possibility of a much bigger impact than investors were anticipating last week. And that could be true for Mexico as well as for China.”

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Food maker Tyson dropped 6.3 per cent after China raised import duties on a $3 billion list of U.S. goods in response to the tariffs on imported steel and aluminum that President Trump ordered last month.

Other recent market leaders like industrial giant Boeing and streaming video service Netflix also slumped.

After a month of public negotiations between the U.S. and several other countries, Monday marked the first time another country has formally placed tariffs on U.S. goods in response to the Trump administration’s recent trade sanctions.

The price of gold climbed 1.2 per cent to $1,343.60 an ounce and silver jumped 2 per cent to $16.60 an ounce as some investors took money out of stocks and looked for safer investments.

Bond prices turned higher. The yield on the 10-year Treasury note fell to 2.72 per cent from 2.74 per cent after a sharp decline last week.

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Amazon fell another $70.84, or 4.9 per cent, to $1,376.50. After peaking at almost $1,600 a share last month, Amazon has slumped with the market recently. Despite its recent losses, Amazon stock is still up about 18 per cent in 2018.

READ MORE: Donald Trump continues attack on Amazon

Microsoft dropped $2.97, or 3.3 per cent, to $88.30 and Google’s parent company, Alphabet, shed $31.13, or 3 per cent, to $1,006.01. Boeing slid $8.25, or 2.5 per cent, to $319.63.

Energy companies skidded as benchmark U.S. crude lost $1.93, or 3 per cent, to $63.01 a barrel in New York. Brent crude, used to price international oils, slid $1.70, or 2.5 per cent, to $67.64 a barrel in London.

WATCH: Donald Trump signs approximately $50 billion in new tariffs on China

0:39 Donald Trump signs approximately $50 billion in new tariffs on China Donald Trump signs approximately $50 billion in new tariffs on China

Wholesale gasoline dropped 5 cents to $1.97 a gallon. Heating oil fell 4 cents to $1.98 a gallon. Natural gas slid 5 cents to $2.68 per 1,000 cubic feet.

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Copper rose 2 cent to $3.05 a pound.

READ MORE: Donald Trump’s proposed tariffs creating fear in heart of Trump country

The dollar declined to 105.85 yen from 106.50 yen. The euro edged up to $1.23 from $1.2306.

Trading in France, Germany and Britain was closed for Easter. Japan’s benchmark Nikkei 225 lost 0.3 per cent and South Korea’s Kospi fell almost 0.1 per cent. The Hang Seng in Hong Kong was closed as well.