BEIJING -- China slammed the latest U.S. tariff threat as a "totally unacceptable" escalation of their trade battle and vowed Wednesday to protect its "core interests." The Commerce Ministry gave no details of possible retaliation but Beijing earlier threatened "comprehensive measures." That prompted fears it might go beyond matching Washington's duty increases by disrupting operations for U.S. companies in China.

The spiraling conflict over U.S. complaints about Chinese technology policy has prompted warnings it might chill global economic growth.

Washington accuses Beijing of stealing or pressuring companies to hand over technology and worries plans for state-led development of Chinese champions in robots and other fields might erode American industrial leadership.

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On Tuesday, the U.S. Trade Representative's office announced a $200 billion list of Chinese goods for possible 10 percent tariffs including fish sticks, apples and burglar alarms. It said that was in response to Beijing's failure to change its policies and to retaliate for last week's U.S. tariff hike by increasing its own duties on American goods.

"It is totally unacceptable for American side to publish a tariff list in a way that is accelerating and escalating," the Commerce Ministry said in a statement Wednesday. "To protect the core interests of the nation and its people, the Chinese government will be forced to impose necessary countermeasures."

China said it was "shocked" and would complain to the World Trade Organization, according to the Reuters news service.

Tuesday's USTR announcement of a possible second round of tariffs came four days after Washington added 25 percent duties on $34 billion of Chinese goods including medical equipment, electronics and factory machinery, and Beijing responded by increasing its own taxes on the same amount of American imports including soybeans and orange juice.

"It is totally unacceptable for American side to publish a tariff list in a way that is accelerating and escalating," said a Commerce Ministry statement. "To protect the core interests of the nation and its people, the Chinese government will be forced to impose necessary countermeasures."

The USTR said the latest action was in response to Beijing's failure to change its policies and its retaliatory duties. President Trump has threatened higher tariffs on more than $500 billion of goods, or nearly all of China's annual exports to the United States.

The USTR will accept public comments and hold hearings Aug. 20-23 before reaching a decision after Aug. 31, according to a senior U.S. official who briefed reporters on condition of anonymity.

The first U.S. tariff list focused on Chinese industrial products to help cushion the impact on American consumers. The latest list hits items that U.S. households buy, including electric lamps, apple juice and fish sticks.

Beijing's lopsided trade balance with the United States means it will quickly run out of imports for retaliation. China imported U.S. goods worth $130 billion last year and Friday's tariff hike hit $34 billion of that, with another $16 billion cited for a possible increase.

China "cannot match fresh U.S. tariffs," Vishnu Varathan of Mizuho Bank said in a report.

Instead, its heavily regulated economy gives Beijing tools to disrupt operations for American automakers, restaurant chains and other companies that are looking to China to drive revenue growth. Regulators can deny or cancel licenses or tie up companies by launching tax, environmental or anti-monopoly investigations.

Companies are watching U.S. chipmaker Qualcomm Inc., which has waited for months for Chinese regulators to decide whether to allow its proposed $44 billion acquisition of NXP Semiconductors. All other major governments have approved the deal.

The economic impact of the conflict already is spreading.

The European Union Chamber of Commerce in China said this week its member companies are rearranging their trade shipments to ensure any bound for the United States don't pass through China.

Members of Congress are increasingly questioning Mr. Trump's aggressive trade policies, warning that tariffs on imports raise prices for consumers and expose U.S. farmers and manufacturers to retaliation abroad.

"Tonight's announcement appears reckless and is not a targeted approach," said Senate Finance Chairman Orrin Hatch in a statement.

Investors had been taking the trade war in stride but Tuesday's announcement appeared to dent that optimism.

On Wednesday, Japan's stock market benchmark fell 1.2 percent while Hong Kong's main index lost 1.7 percent and the Shanghai Composite index dropped 2.1 percent.

The conflict is "far from over," Hannah Anderson of JP Morgan Asset Management warned in a report, "and the impact will be global."