Hackers have cruelly targeted the Epilepsy Foundation's Web site with links to images that are likely to induce fits in epilepsy sufferers.
In an attack motivated purely by malice, the site has been bombarded with hundreds of links to pages containing rapidly-flashing images.
The images can trigger fits in people suffering from photosensitive epilepsy.
Hackers made use of a feature on the site that allows users to post images and links to other sites. Designed to allow legitimate users to include useful content, the feature has now been removed.