MELBOURNE, May 31 (Reuters) - Australia's largest meat works, a unit of Brazil's JBS SA, was hit over the weekend by a major cyber attack on its information systems, an industry news website reported, citing the firm's Australian chief executive.

The attack shut down operations across Australia, JBS Australia Chief Executive Officer Brent Eastwood told Beefcentral on Sunday. He was not able to say how long the stoppage would last, according to the news website.

It was unclear, according to the report, if operations of the world's largest meatpacker in other countries such as Canada and the United States would also be impacted. Monday marks the U.S. Memorial Day public holiday.

JBS Australia said it was unable to speculate about a resumption of processing operations in the country, and its first priority was to assess the impact and extent of the attack, according to the report. However, processing operations would be impossible without normal access to IT and internet systems, it said. JBS’s Primo Smallgoods business in Queensland state has also been impacted, the report said.

JBS did not immediately reply to an emailed request for comment.

(Reporting by Melanie Burton; Editing by Kirsten Donovan)