The latest video from hip-hop star Kanye West could cause epileptic seizures, experts have warned.
Epilepsy Action said the extensive use of flashing images in the video for "All of the Lights", which also features the singer Rihanna, could trigger seizures in some people.
The video has received almost 5 million hits on YouTube since its premiere last weekend.
Experts at Cambridge Research Systems found the video contained flashes at a rate high enough to trigger seizures in people with photosensitive epilepsy.
According to Ofcom regulations, the video should not be broadcast on UK television but there are no such rules governing online. A spokeswoman for Epilepsy Action said the charity had contacted YouTube to ask that they remove it.