SALEM, N.C. - A 17-year-old North Carolina girl who recorded a livestream of a shooting that killed three people at a San Diego mosque and disseminated the attackers' white-supremacist writings has been charged with murder by aiding and abetting, a district attorney said Monday.

Forsyth County District Attorney Jim O'Neill said at a news conference in Winston-Salem that the girl, whose name was not mentioned during the news conference, was arrested last week.

On Monday, just before she was due to begin the school year, a grand jury indicted her on three counts of murder and one count of conspiracy.