The UK government is considering setting up a national blocking list of violent and unlawful websites in plans to tackle radicalisation to be unveiled by Home Secretary Theresa May.
The government wants to ensure that users in schools, libraries, colleges and Immigration Removal Centres are unable to access unlawful material.
The government's revised Prevent strategy, launched in 2007 to stop the growth of home-grown terrorism, will say the internet is key to preventing radicalisation, according to reports.
The strategy is to propose exploring the potential for violent and unlawful URL lists to be voluntarily incorporated into independent national blocking lists.
The government also plans to increase collaboration with the EU and the US to tackle online extremism, particularly as the US is the biggest provider of internet hosting services in the world.