A cyberattack on the world’s largest meat processor forced the shutdown of nine beef plants in the United States on Tuesday, according to union officials, and disrupted production at poultry and pork plants. The attack could upset the nation’s meat markets and raises new questions about the vulnerability of critical American businesses.

The company, JBS, said the majority of its plants would reopen on Wednesday. But even one day’s disruption at JBS could “significantly impact” wholesale beef prices, according to analysts at Daily Livestock Report.

The breach at JBS was a ransomware attack, the White House said — the second recent such attack to freeze up a critical U.S. business operation. Last month, a ransomware attack on Colonial Pipeline, which transports gas to nearly half the East Coast, triggered gas and jet-fuel shortages and panic buying.

JBS, which is based in Brazil and accounts for one-fifth of the daily U.S….

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