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NEW YORK (AP) - Thousands and possibly millions of websites hosted by GoDaddy.com were down Monday, causing trouble for the mainly small businesses that rely on the service.

A Twitter feed that claims to be affiliated with the "Anonymous" hacker group says it was behind the outage, but it couldn't be confirmed. Another Twitter account, known to be associated with Anonymous, suggested the first one was just taking advantage of an outage it had nothing to do with.

A GoDaddy spokeswoman says the company was still investigating the cause and working to restore service.

GoDaddy.com hosts more than 5 million websites, mostly for small businesses. Websites that were complaining on Twitter about outages included MixForSale.com, which sells accessories with Japanese animation themes, and YouWatch.org, a video-sharing site.