Domestic Terrorism

A full day after the shooting, the gunman's motive remains a mystery.

"Active participation" in groups that advocate supremacist, extremist or criminal gang ideologies is prohibited.

Though the FBI isn’t currently tracking an “organized threat” inside the United States, law enforcement is concerned about...

The idea that far-right extremism poses a threat to the country has been contested by political pundits and some Republican...

The new analysis comes as the Pentagon and the services try to grapple with the idea of extremism within the ranks.

Brandon Clint Russell, a former Guardsman, and Sarah Clendaniel are accused of conspiring to carry out attacks to further...

A new Apple Original podcast lets the people who lived through the attack tell their compelling stories.

The Navy has confirmed that a sailor was among the 18 injured in the Colorado nightclub shooting on Nov. 19 that also left...

The Homeland Security and Governmental Affairs Committee's 129-page report asked the Departments of Justice and Homeland...