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NEW YORK (CBSMiami/CNN) – President Donald Trump’s announcement that his administration will impose tariffs on steel and aluminum imports caused stocks to plummet on Wall Street.

The Dow Jones Industrial Average dropped more than 500 points. The Nasdaq and the S&P 500 declined about 1.5% apiece.

By early afternoon they had recovered a bit but investors were still worried about a trade war.

Trump’s controversial tariff announcement raised concerns about retaliation from China or other major U.S. trading partners.

“This is the first shot across the bow over a trade war,” said Art Hogan, chief market strategist at B. Riley FBR. “And nobody wins a trade war.”

Trump said his administration would impose a 25% tariff on steel imports and a 10% tariff on aluminum. It was not immediately clear whether Trump would exempt some countries from the tariffs, as his national security advisers have urged him to do to avoid hurting U.S. allies.

Corporate America has warned Trump that tariffs could backfire. Last month, the Business Roundtable warned of the risk of “foreign retaliation” that would “harm the U.S. economy.” Investors will be looking to see how U.S. trading partners react to the tariffs.

Beyond worries about retaliation, the tariff news drove concerns about rising costs for companies that rely heavily on aluminum and steel, like auto and plane makers.

Imports make up about a third of the steel American businesses use every year and more than 90% of aluminum used here. Shares of Boeing, General Motors and Ford fell about 4% apiece. If the tariffs result in higher prices on steel and aluminum, companies that rely on those products may pass on some of the costs to consumers. That raises the specter of creeping inflation.

“This clearly will [lead to] higher prices in the production chain, which is part of the inflation path,” said Quincy Krosby, chief market strategist at Prudential Financial.

Concerns about trade come at an already shaky time on Wall Street. The S&P 500 and Dow fell about 4% in February, their worst month in two years. Fears about inflation and soaring bond yields caused a surge in volatility, including two 1,000-point plunges for the Dow.

The market had come back as investors focused on the strong economy and booming corporate profits. But stocks fell sharply again on Tuesday and Wednesday. Turbulence has picked up as well. The VIX volatility index spiked 27% on Thursday. Selling pressure will climb as volatility increases, Krosby said.

At least two corners of the stock market cheered Trump’s tariff announcement. U.S. Steel and AK Steel soared 8% and 11%, respectively.

Century Aluminum also spiked 8%. Another major aluminum maker, Alcoa, gained 2%.

Trump’s tariff moves could force investors to confront another trade issue: NAFTA. Trump has repeatedly threatened to tear up this major trade deal with Canada and Mexico. Talks to renegotiate NAFTA, a major piece of the U.S. economy, have so far failed to produce a solution.

“It sets off the protectionist fears that had been lying dormant,” said Hogan.

(©2018 CBS Broadcasting Inc. All Rights Reserved. CNN contributed to this report.)

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