Adidas, the German sportswear and equipment maker, said Sunday that all its websites remained closed down Sunday after what it called a "sophisticated and criminal" attack.
"Our preliminary investigation has found no evidence that any consumer data is impacted. But, while we continue our thorough forensic review, we have taken down affected sites," Adidas said in a statement which replaced the home page on its www.adidas-group.com website.
It said the attack first came to light on Thursday, with its Reebok and several online shops all affected.
The company did not give any further information about the attack or who may have been behind it in the statement.
Explore further: After a decade online, YouTube is redefining celebrity