Adidas has taken down numerous of its websites after suffering a "sophisticated, criminal cyberattack".
The German sportswear giant on Sunday posted a message stating that it had found no evidence that consumer data was impacted, however added that its forensic review was ongoing.
Adidas bolstered data security measures after learning about the attack, which it said occurred on Thursday November 3, the day it released its third quarter results.
Affected sites include adidas.com, reebok.com, miCoach.com, adidas-group.com and "various local eCommerce shops". Adidas' Australian domain adidas.com.au was also taken offline.
Some of its e-commerce properties remain online, such as the adidas shop serving North America and parts of Europe.
Sony had similarly described the May attacks on its PlayStation Network as sophisticated, but it did not become aware of the extent of its breach which affected over 77 million customers until further investigations.