The gunman behind this week’s school shooting in Colorado was “radicalized by an extremist network,” authorities in Jefferson ...

A 16-year-old student, who authorities say opened fire at his Colorado high school on Wednesday, was believed to be ...

Investigators say the 16-year-old gunman who opened fire at a Colorado high school had been radicalized by an extremist ...

Two students were wounded in the shooting at Evergreen High School near Denver, and the shooter then killed himself, ...

Investigators said Thursday that they have identified the shooter responsible for the Wednesday afternoon shooting at ...

Desmond Holly’s focus on the 1999 massacre at Columbine High School is a central feature of these online extremist ecosystems ...

The Colorado high school shooting suspect, who was identified as a 16-year-old student, was believed to be "radicalized by some extremist network,” officials said.

The Oath Keepers are apparently restarting, and extremist groups like the Proud Boys are calling for “state violence” in the ...