The cybersecurity incident that prompted ports operator DP World Australia to halt operations at ports across multiple states since Friday was deemed “serious and ongoing” by the Australian government on Sunday.

Said to be investigating potential data breaches and testing systems “crucial for the resumption of normal operations and regular freight movement” is DP World Australia, which oversees almost half of the products that enter and exit the nation.

The breach halted operations at the containers terminals in Melbourne, Sydney, Brisbane and Western Australia’s Fremantle since Friday.

“The cyber incident at DP World is serious and ongoing,” Home Affairs Minister Clare O’Neil said on social media platform X, formerly known as Twitter.

A DP World spokesperson did not immediately respond to a Reuters request for comment on when normal operations would resume. The company, part of Dubai’s state-owned DP World, is one of a handful of stevedore industry players in the country.

The Australian Federal Police said they were investigating the incident, but declined to elaborate.

Late on Saturday, the National Cyber Security Coordinator Darren Goldie, appointed this year in response to several major data breaches, said the “interruption” was “likely to continue for a number of days and will impact the movement of goods into and out of the country”.

In the Asia-Pacific region, DP World says it employs more than 7,000 people and has ports and terminals in 18 locations.