A unit of Toshiba Corp. has been hit by a ransomware attack, overshadowing an announcement of a strategic review for the conglomerate and an upbeat profit forecast.

Toshiba Tec Corp., which makes point-of-sale systems and copiers, said it had been hacked by DarkSide, the group the United States FBI has blamed for the Colonial Pipeline attack, according to the firm's French subsidiary. It said only a minimal amount of work data had been lost.

Reuters could not access DarkSide's public-facing website on Friday. Security researchers said DarkSide's multiple websites had stopped being accessible.