The Home Office has launched a page for people to report online extremism and terror-related content.
The section of the Directgov website will link directly to a team within the Association of Chief Police Officers Prevent Delivery Unit for investigation.
The site starts by checking people are not trying to report an actual real world crime happening now.
Assuming you are not, it goes on to ask if you are reporting a hate crime, web content which encourages or praises terrorism or terrorist training material.
If police find the site does "meet the threshold for illegal content" it can be removed under the 2006 Terrorism Act.
Content likely to meet this threshold includes bomb-making instructions, poison recipes and instructions on making weapons.
Illegal violent extremist content includes videos of beheadings with messages of praise for the attackers, speech or writing which calls for racial or religious violence, content designed to stir up hatred against any religious or ethnic group and chat forums with messages calling for people to commit acts of terrorism.
Full press release is here.