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A cyberattack on JBS SA, the largest meat producer globally, forced the shutdown of all its U.S. beef plants, wiping out output from facilities that supply almost a quarter of American supplies.

All of the company’s fed-beef and regional beef plants were forced to shutter, and all other JBS meatpacking facilities in the country experienced some level of disruption to operations, according to an official with the United Food and Commercial Workers International Union.

JBS didn’t immediately respond to a request for comment. The union represents workers at the company’s plants in the U.S.

Slaughter operations across Australia were also down, according to a trade group, and one of Canada’s largest beef plants was idled. That comes after a weekend attack on the Brazilian company’s computer networks, according to JBS posts on Facebook, labor unions and employees.