To understand the threat better, we need to devote more resources to monitoring and tracking far-right forums and social networks and a national database tracking hate crimes.
Extremism and terrorism should not be simply interlinked.
This selection of films shows the problem of extremism in its complexity, examining how real people can become radicalised.
A survey by the Commission for Countering Extremism revealed many don't feel able to define extremism – or found the government's definition helpful.
Why the extremism definition is unfit for purpose.
Bin Laden's extremist group had less than a hundred members in September 2001. Today it's a transnational terror organization with 40,000 fighters across the Middle East, Africa and beyond.
Social media companies struggle to identify and remove hate speech when it's posted. What can computer science reveal about how hate-filled texts and videos spread online?
The arguments of far right commentators who conflate Islam with extremism are flawed. In the rich and complex tradition of Islam, extremists are a small minority who often target other Muslims.
Research shows that unrest, even terrorism, can erupt in poor countries with a surplus of young people and not enough jobs. Can Niger, a once-peaceful sub-Saharan African nation, handle its baby boom?
What can social media platforms do after terrorist attacks?
Somali community leaders should help to foster links with their traditional culture.
While nationalism is a dirty word, we often underestimate the power of its ideal in contemporary societies. We live in a world of nations, which provide identity and belonging for many people.
Law enforcement officials aren't trained in recognizing hate crimes, leaving national numbers on these attacks unreliable.
Despite the publication of promising new statistics on referrals to the Prevent counter-terrorism programme, the strategy remains a blunt instrument.
The extent to which schools foster political deliberation, engagement, understanding and empathy has far-reaching implications for our democracy.
The shooting at a Pittsburgh synagogue joins a list of more than 200 other ideologically motivated attacks by far-right extremists since 1990.
The attack at a synagogue in Pittsburgh and the sending of pipe bombs to critics of the current administration are examples of the increase in the violence on the margins of the right.
An analysis of budget documents suggests that federal funding for community-based, counter-terrorism programs has dried up.
Is controversy extremist? The Charity Commission seems to think so.
The extremist network al-Muhajiroun has rebuilt itself before, but that doesn't mean it's destined to again.