LOS ANGELES, California, September 1, 2026 — A North Carolina grand jury on Monday charged a 17-year-old girl in connection with the fatal shooting of a mosque in California. In it, Sarah Lindsey Santiago is charged with three counts of murder by aiding and abetting. According to prosecutors, she live-streamed the attack on the Islamic Center of San Diego on May 18.
What She Allegedly Did
“This person here, local, was the one recording the live stream,” Forsyth County District Attorney Jim O’Neill said. “‘She distributed that information and she published their manifesto, ‘he said. Santiago also purportedly sent a patch with a white supremacist symbol he wore during the attack to one shooter.
Prosecution said she had previously arranged for the shooters to carry out the preparation of the livestream. While Santiago has been charged with three counts of conspiracy, investigators said three people watched the stream as it happened. Last week, she was arrested just before going back to school for the new academic year.
The Shooters and the Attack
Cain Clark, 17, and Caleb Vazquez, 18 entered the mosque on May 18 before being chased outside by a security guard. The pair exchanged gunfire with the guard, Amin Abdullah, who then locked down in place. That response is credited with saving the lives of about 140 children who were in the building.
Once inside the home, Clark and Vazquez shot Abdullah and two other men, then drove a short distance away in a nearby vehicle to commit suicide. They had written that they were inspired by the 2019 Christchurch mosque shooter. The pair has bridged an “underground subculture” that O’Neill works to radicalize people through the Internet into violence, he said.
Why She Faces State Charges
Prosecutors were able to pursue state charges instead because of North Carolina law, which allows them to treat her as an adult. State charges carry a term of life in prison without parole if she’s convicted. Facing state charges meant she could receive life without parole compared to shorter federal sentences.
O’Neill referred to the online network as “an echo chamber of extreme hatred toward various cultures and religions.” Members of the group communicated using encrypted messaging apps in order to evade law enforcement, he said. Investigators were also continuing to explore whether others involved should be charged.
Community Reaction
Since May, the San Diego mosque community has been following developments in the case. Advocacy groups at the local level instructed schools and residents to remain alert for the possibility of further radicalization, particularly of young people online. It has reignited national attention to the role that social media plays in extremist violence.
Santiago is set to appear in a local court in the coming days. A representative for her legal team has not publicly commented on the charges. The federal U.S. Department of Justice offers guidance on Hate Crime Prevention.
The case, legal analysts say, adds to murky questions over whether those who amplify violence espoused by extremist groups online are liable. Civil rights groups have pushed for ongoing observation of encrypted sites employed to facilitate these attacks. The nationwide investigation into the online network remains open as authorities examine digital evidence at the Federal Bureau of Investigation.
The case has renewed the debate over how prosecutors should charge minors when they are accused of participating in organized hate crimes. On the one hand, parents groups have urged greater clarity about warning signs of online radicalisation, which are detailed by the Cybersecurity and Infrastructure Security Agency. Investigators say the investigation could grow, still, if evidence connects further accomplices, with youth legal frameworks accessible via the Office of Juvenile Justice and Delinquency Prevention.
