YouTube's most viewed music video Despacito, which has had over five billion views, has been hacked.
The clip's cover image was replaced with a photo showing a group of people wearing masks and pointing guns.
The video was temporarily taken offline until the problem was fixed.
Videos by more than a dozen other artists posted by the music hosting service Vevo - including Shakira, Selena Gomez, Drake and Taylor Swift - were also affected.
The video has since been reloaded.