YouTube is to ban footage showing weapons being used to intimidate people on its website in the UK.
The new policy was being introduced because of "particular concern" in Britain over the subject, the site's owners, Google, said.
MPs criticised video-sharing websites, including YouTube, in July, saying they should be doing more to vet content.
Home Secretary Jacqui Smith welcomed the YouTube ban and called on other internet sites to follow suit.
YouTube said the introduction of the new rule on weapons and intimidation would be the first time the site had made a policy change targeted specifically at the UK.