The San Diego mosque shooting that killed three people in May has produced an indictment nearly 2,000 miles from the crime scene, after prosecutors in North Carolina charged a 17-year-old girl with helping the two teenage gunmen carry out the attack.

Sarah Lindsay Santiago was indicted Monday in Forsyth County on three counts of murder and one count of conspiracy. District Attorney Jim O’Neill said a multi-agency investigation uncovered evidence she worked with the shooters to record and distribute a livestream of the attack.

What Prosecutors Allege

The accusations extend beyond the broadcast itself.

According to prosecutors, Santiago:

• Coordinated with the gunmen to record and disseminate the livestream
• Sent them the hate-filled patches they wore during the attack
• Published their manifesto afterward

She will be tried as an adult because of the terrorism-related nature of the case.

O’Neill said she was arrested a week before the grand jury indictment because investigators did not know what she was capable of. He emphasised that geography was not a barrier to prosecution, noting she did not need to be in California to be held responsible, and that she fell within his jurisdiction.

She is charged with three counts of first-degree murder and conspiracy, and is expected to appear in a North Carolina court on 21 September.

What Happened on 18 May

Two teenage gunmen wearing camouflage opened fire at the Islamic Center of San Diego in the Clairemont neighbourhood. They later shot themselves in a nearby car.

Three people were killed outside the centre: security guard Amin Abdullah, mosque caretaker Mansour Kaziha, and neighbour Nadir Awad.

Authorities say those three men almost certainly prevented a far worse outcome by slowing the attackers down.

O’Neill described Abdullah, a father of eight who also cared for his own father, grabbing his weapon and wounding one of the shooters. That intervention likely stopped the pair from moving on the Islamic school next door, where 140 students were sheltering in place.

The Attack That Did Not Happen

Investigators say the mosque was intended as the first stop, not the last.

The indictment states the shooters planned to attack Kehilat Ariel Messianic Synagogue, about 1.5 miles away off Clairemont Mesa Boulevard. O’Neill said their intent was mass murder at the mosque followed by the synagogue, with a local high school as the final target.

They killed themselves instead of continuing.

Rabbi Barney Kasdan of Kehilat Ariel spoke to NBC San Diego on Monday evening, saying that somehow God directed them away from his congregation if that was indeed their intention.

He said he remains confident in his synagogue’s security protocols, with armed guards visible at every major event. He was not surprised the synagogue appeared on the attackers’ list given its proximity to the Islamic Center.

His broader comment cut across the divide the attackers were targeting. Even though the two communities are very different, he said, and politics sometimes gets in the way, there is no place for hate.

The Legal Message

FBI Special Agent in Charge Reid Davis focused on the opportunities Santiago allegedly had to prevent the attack.

He said that when someone has credible knowledge that a violent crime is being planned or is about to occur, the law requires them to come forward, and that failing to do so must carry consequences.

San Diego FBI Special Agent in Charge Mark Remily framed the point more broadly, saying that whether a person is physically present at an act of violence or supporting it from 2,000 miles away, accountability can follow, and that in this case the charges are as serious as they come.

Online Radicalization at the Centre

O’Neill described the attack as the first ideologically motivated one of its kind in a century and directed part of his remarks at parents.

He described an underground subculture of hate operating on coded platforms, where participants talk to one another and reinforce each other’s beliefs until some of them act violently.

That description matches a pattern investigators have documented repeatedly in recent years: young people forming networks online that span states and countries, where roles divide between those who act and those who amplify.

The indictment tests exactly that division. Prosecutors are arguing that supplying materials, coordinating a broadcast and publishing a manifesto constitutes participation in the killings rather than commentary on them.

The Investigation

The case was built by the Forsyth County District Attorney’s office working with FBI joint terrorism task forces in both Charlotte and San Diego, alongside the San Diego and Winston-Salem police departments.

San Diego County District Attorney Summer Stephan’s office was aware of the prosecution and present to support the victims.

Federal agents and local law enforcement in San Diego have executed more than 30 search warrants as part of the investigation.

The Islamic Center was not able to provide comment on Monday.

What Comes Next

Rabbi Kasdan said the indictment brought relief, adding that it demonstrates the dangers of hate spreading through social media and that he is glad investigators identified her and anyone else involved.

The case now moves toward Santiago’s court appearance later this month. As a prosecution of a minor tried as an adult, charged with murders committed in another state by people she never physically joined, it raises questions that will be argued at length.

This remains a developing story, and details may change as more information is released.