SAN FRANCISCO -- A Web site set up the Epilepsy Foundation has been hit by hackers, in an attack apparently motivated by malice, rather than money.

An official with the foundation says computer hackers breached the foundation's site, bombarding it with hundreds of pictures and links to pages with rapidly flashing images.

The images can be harmful to people with photosensitive epilepsy because they can suffer seizures when they're exposed to flickering images.

The foundation says the successful attack triggered severe migraines and near-seizure reactions in some site visitors who viewed the images.

The foundation says the FBI is investigating the breach.