Stocks fell Tuesday after China's devaluation of its currency signaled the government's growing worry about slow growth.

The move, which followed weak export and import data from China over the weekend, marked the latest round in Beijing's efforts to prop up its slowing economy. Concerns about the pace of global growth this year have weighed on commodity prices and helped keep a lid on U.S. stocks for the year. Weakening economic growth dims the outlook for corporate profits and future gains in stocks.

China's devaluation boosted demand for safe-haven Treasury debt.

"It's another step by the People's Bank to support the economy and stabilize the economy, which continues to weaken," said Craig Bishop, lead strategist of U.S. fixed-income strategies at RBC Wealth Management. "A slowdown in an economy of that size causes a lot of ripples."

S&P 500 futures fell 0.7% to 2086. Changes in futures aren't necessarily reflected in market moves after the opening bell.

The pan-European Stoxx Europe 600 index declined 1.1%. In Asia, currencies tumbled and most stock markets fell.

The onshore yuan on Tuesday posted its biggest one-day loss in two decades. A weaker yuan could hurt the competitiveness of firms outside China by making their goods and services relatively more expensive, while companies that generate sales in China could find revenue generated in yuan is worth less in their home currency.

Treasury prices rose, pushing the 10-year yield down to 2.176% from 2.238% on Monday. Crude-oil futures lost 2.3% to $43.92 a barrel.

Gold futures rose 0.4% to $1108.60 an ounce.

In corporate news, Google Inc.'s sweeping reorganization continued to capture investors' attention. The move will separate its highly profitable search and advertising business from other efforts, and create a holding company called Alphabet Inc. Shares rose 5.2% in premarket trading.

Symantec Corp. said Tuesday it agreed to sell its Veritas business to a group of investors led by private-equity firm Carlyle Group LP for $8 billion in cash. Shares rose 2.5% premarket.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com and Christopher Whittall at christopher.whittall@wsj.com

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