According to the Financial Times Deutschland (FTD) newspaper on Monday, the attacks started last Thursday and targeted key sites, including adidas.de and reebok.de, although its US-facing online store was spared because it is hosted on a different computer. The company promised customers will be compensated with a future 10 percent discount, the newspaper reported.

By Monday, the German shopping site was reachable although some pages appeared to still be down. A statement on the website cited “technical difficulties” for the problems.

A company spokesman told the FTD that the company was the victim of “criminal cyber attacks” and added it was working with authorities and launching its own investigation.

The company didn’t say how many customers were affected, but said they took the sites offline to ensure their data had not been compromised.

There have been warnings of serious hacker attacks on Germany’s private sector for quite some time. Last July, the Federal Office of Civil Protection (BKK) said hackers could attempt to penetrate soft civilian targets. They have already extensively targeted government computers.

Adidas executives were upbeat last week when the company said it would beat profit expectations for this year. It’s third quarter net income rose 14 percent to €303 million.

The Local/mdm