At least three people watched a livestream as gunmen filmed their deadly attack at the Islamic Center of San Diego on Monday.

The family of one of the suspects in a deadly shooting at a San Diego mosque this week said his exposure to hateful and extremist content online “contributed to his descent into radicalized ideologies ...

The two teenage suspects in this week’s deadly attack on a San Diego mosque appear to have written a 75-page document replete ...

The videos so frequently cite one another that they’ve raised fears from extremism experts that they could motivate copycats.

Authorities say two teens behind the deadly shooting were inspired by extremist online content, including the 2019 massacre ...