Several sites around the world were reportedly broken into and tampered with earlier this week by one or more people claiming to be calling attention to the fight between the music industry and the digital music-swapping Web site Napster.

A manifesto of sorts was posted in support of Napster's fight against music industry labels, titled ""The Save Napster Hack Attack."

Though all the sites were apparently restored within 24 hours, with the exception of broken links, which may not have anything to do with the crackers, a cached version of the pro-Napster post is visible on Attrition.org, a site that collects information about Web-site attacks.

The FBI is "looking into the reports," said FBI spokeswoman Debbie Weierman.

A federal judge ruled against Napster in a lawsuit filed by record companies represented by the Recording Industry Association of America, ordering the site to take action to stop copyright violations, but that order was stayed pending appeal.