Shipbuilder Vard has suffered a cyber-attack in Norway, police have said.
Police inspector Kjell Arne Hestad of the More and Romsdal force said the incident involved a data breach around 1 June, domestic media reported.
The attack is said to have involved an encryption virus that locked company servers.
"What kind of data breach and what consequences this has for the company, we do not want to comment on now. But it is a complex matter, and we are working with [National Criminal Investigation Service] Kripos to solve this in the best possible way," Hestad said in newspaper Romsdals Budstikke.
Norway-based Vard also operates yards in Brazil, Vietnam, Romania and Singapore.
Vard has not commented. Parent group Fincantieri, the Italian shipbuilder, has confirmed the attack, but told TradeWinds it had no further comment to make.
The attack is the latest in a series of cyber incidents involving some big shipping names in the last few years.
Swiss boxship and cruiseship group Mediterranean Shipping Co (MSC) was hit in April, but said no data was lost.
Around the same time, Danish pump maker DESMI said it would not succumb to blackmail by hackers who attacked its IT systems.
In November, London tanker owner James Fisher was the victim of an attack, more than two years after a high-profile NotPetya onslaught hit AP Moller-Maersk's digital network at a cost of $300m.
