CARGO handling was returning to normal at Nagoya, one of Japan's busiest ports, after a suspected ransomware attack disrupted operations for 48 hours, reported New York's Journal of Commerce.

The Nagoya Harbour Transportation Association, which oversees container handling operations at Nagoya's terminals, said the Nagoya terminal computer network resumed real-time operation Thursday morning after being targeted by hackers.

The transportation association said Russia's LockBit 3.0 hacker group was responsible for the attack and had demanded a ransom to restore the system. Data lost in the cyberattack was restored Thursday afternoon local time, the association said in a statement.

Police in Japan are investigating the incident, Japanese media reported.

The failure meant the computer system was unable to process gate-in and gate-out containers being moved by truck, the association said.

Ocean Network Express (ONE) said container operations on three vessels were affected by the disruption, but that loading and unloading had been completed. The vessels have departed Nagoya, ONE said in a customer advisory Thursday.

Nagoya is Japan's second-busiest container port behind Tokyo, handling 2.4 million TEU in 2022, according to provisional figures from Nagoya Port Authority. But Nagoya is Japan's largest port based on total cargo volumes, handling 164 million tons last year, the authority added.