Trade war fears rocked Wall Street on Thursday after President Trump launched a crackdown on China.
The Dow plummeted 724 points, or 2.9%, underlining mounting concerns among investors about looming tariffs on China. It was the fifth-largest point decline in history and the market's worst day since the extreme turmoil of early February.
The S&P 500 dropped 2.5% and the Nasdaq 2.4%.
"A global trade war, whether it's real or perceived, is what's weighing on the market," said Ian Winer, head of equities at Wedbush Securities. "There's this huge uncertainty now. If China decides to get tough on agriculture or anything else, that will really spook people."
Trump announced tariffs on about $50 billion worth of Chinese imports on Thursday afternoon. It's not clear which products will be hit, but the action is aimed at curbing China's troubling theft of US intellectual property.
"We have a tremendous intellectual property theft situation going on," Trump said. He also described the US trade deficit with China as "out of control."
China wasted little time in threatening to retaliate against the United States, underlining the risk of a tit-for-tat escalation that hurts global trade.
Beijing warned on Thursday it will "certainly take all necessary measures to resolutely defend" itself. China didn't specify how it will respond, but US crops like soybeans are likely to be in the crosshairs.
"There is a lot of panic selling," said Rich Guerrini, CEO of PNC Investments. "Are the tariffs a means of negotiating? There's a decent chance of that, but it's too early to tell."
CNNMoney's Fear & Greed Index, a measure of market sentiment, dropped further into "extreme fear." The VIX volatility index soared 22%, though it remains well off the elevated levels of early February.
Wall Street's biggest fear is a trade war, according to a recent survey of fund managers by Bank of America Merrill Lynch. The survey, released this week, found that for the first time since January 2017 the threat of a trade war topped inflation as the biggest risk to markets.
"What does this evolve into?" asked Mark Luschini, chief investment strategist at Janney Capital. "Should it denigrate into something that impairs business sentiment, that can feed into the economy and slow job growth."
The biggest losers on the Dow on Thursday included stocks with significant exposure to China: Caterpillar, 3M and Boeing.
Michael Block, chief strategist at Rhino Trading Partners, said in a report that Trump's tariff plan "has markets and the world at large freaking out a little."
The trade crackdown is a big deal because the United States and China are the world's two biggest economies. A major slowdown in trade could darken the otherwise bright economic outlook.
China is a major buyer of US crops, and Americans purchase tons of Chinese-made products. China is also America's biggest creditor, owning more Treasuries than any other nation.
Some market analysts questioned the wisdom of broad tariffs to tackle the very real problem of intellectual property theft.
"Isn't there another way to deal with this that is more targeted?" Peter Boockvar, chief investment officer at The Bleakley Advisory Group, wrote in a report. "The American consumer again will be the pawn that pays for this."
The trade worries could prove overdone if tensions between the United States and China ease.
Initial concerns about Trump's tariffs on aluminum and steel relaxed after the administration softened its stance by offering exemptions for Canada and Mexico. The United States later granted tariff exemptions for major allies like the European Union, South Korea and Australia.
That news didn't sit well with steel and aluminum makers. U.S. Steel plunged 9% and Alcoa dropped 5%.
Nervousness on Wall Street wasn't eased by the latest White House drama. The market fell further after Trump's lead lawyer, John Dowd, resigned from the president's personal legal team handling the Russia investigation.
Trump has recently taken a more aggressive stance against Special Counsel Robert Mueller. The market would probably fall sharply, at least at first, if Trump were to fire Mueller, analysts say.
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