CANBERRA, Australia (AP) — A ransomware attack on the world’s largest meat processing company is disrupting production around the world just weeks after a similar incident shut down a U.S. oil pipeline.

Brazil’s JBS SA, however, said late Tuesday that it had made “significant progress” in dealing with the cyberattack and expected the “vast majority” of its plants to be operating on Wednesday.

“Our systems are coming back online and we are not sparing any resources to fight this threat,” Andre Nogueira, CEO of JBS USA, said in a statement.

JBS SA of Brazil notified the U.S. of a ransom demand from a criminal organization likely based in Russia, White House principal deputy press secretary Karine Jean-Pierre confirmed Tuesday. She said the White House and the Department of Agriculture have been in touch with the company several times this week.

JBS is the second-largest producer of beef, pork and chicken in the U.S. If it were to shut down for even one day, the U.S. would lose almost a quarter of its beef-processing capacity, or the equivalent of 20,000 beef cows, according to Trey Malone, an assistant professor of agriculture at Michigan State University.

In a statement, JBS said the cyberattack affected servers supporting its operations in North America and Australia. The company said it notified authorities and engaged third-party experts to resolve the problem as soon as possible. Backup servers weren’t affected.

Malone said the disruption could further raise meat prices ahead of summer barbecues. Even before the attack, U.S. meat prices were rising due to coronavirus shutdowns, bad weather and high plant absenteeism. The U.S. Department of Agriculture has said it expects beef prices to climb 1% to 2% this year, poultry as much as 1.5% and pork between by from 2% and 3%.

JBS didn’t say which of its 84 U.S. facilities were closed Monday and Tuesday because of the attack. But a union official confirmed that two shifts at the company’s largest U.S. beef plant, in Greeley, Colorado, were canceled Tuesday.

Some plant shifts in Canada were also canceled Monday and Tuesday, according to JBS Facebook posts.

In Australia, thousands of meat plant workers had no work for a second day Tuesday, and a government minister said it might be days before production resumes. JBS is Australia’s largest meat and food processing company, with 47 facilities across the country including slaughterhouses, feedlots and meat processing sites.

The closures reflect the reality that modern meat processing plants are heavily automated, for both food- and worker-safety reasons. Computers collect data at multiple stages of the production process, and orders, billing, shipping and other functions are all electronic.

JBS has not stated publicly that the attack was ransomware.

Jean-Pierre said the White House “is engaging directly with the Russian government on this matter and delivering the message that responsible states do not harbor ransomware criminals.” The FBI is investigating the incident, and the Cybersecurity and Infrastructure Security Agency is offering technical support to JBS.

In addition, USDA has spoken to several major meat processors in the U.S. to alert them to the situation, and the White House is assessing any potential impact on the nation’s meat supply.

JBS has more than 150,000 employees worldwide.

It’s not the first time a ransomware attack has targeted a food company. Last November, Milan-based Campari Group said it was the victim of a ransomware attack that caused a temporary technology outage and compromised some business and personal data.

In March, Molson Coors announced a cyber attack that affected its production and shipping. Molson Coors said it was able to get some of its breweries running after 24 hours; others took several days.

Ransomware expert Brett Callow, a threat analyst at the security firm Emsisoft, said companies like JBS make ideal targets.

“They play a critical role in the food supply chain and threat actors likely believe this increases their chances of getting a speedy payout,” Callow said.

Mark Jordan, who follows the meat industry as the executive director of Leap Market Analytics, said the disruption could be minimal assuming JBS recovers in the next few days. Meat processers are used to dealing with delays because of a host of factors, including industrial accidents and power outages, and they make up lost production with extra shifts, he said.

“Several plants owned by a major meatpacker going offline for a couple of days is a major headache, but it is manageable assuming it doesn’t extend much beyond that,” he said.

Jordan said it will help that U.S. meat demand generally eases for a few weeks between Memorial Day and the July 4 Independence Day holiday.

But the attacks can wreak havoc. Last month, a gang of hackers shut down operation of the Colonial Pipeline, the largest U.S. fuel pipeline, for nearly a week. The closure sparked long lines and panic buying at gas stations across the Southeast. Colonial Pipeline confirmed it paid $4.4 million to the hackers.

Jason Crabtree, the co-founder of QOMPLX, a Virginia-based artificial intelligence and machine learning company, said Marriott, FedEx and others have also been targeted by ransomware attacks. He said companies need to do a better job of rapidly detecting bad actors in their systems.

“A lot of organizations aren’t able to find and fix different vulnerabilities faster than the adversaries that they’re fighting,”‘ Crabtree said.

Crabtree said the government also plays a critical role, and said President Joe Biden’s recent executive order on cybersecurity — which requires all federal agencies to use basic security measures, like multi-factor authentication — is a good start.

Durbin reported from Detroit. AP Writer Alan Suderman in Richmond, Virginia, and Alexandra Jaffe in Washington contributed.