Fremont police on Wednesday arrested a child suspected of threatening "an act of violence" at an unspecified school campus.
Early Wednesday, someone reported that a Fremont Unified School District student, who is believed to have access to a firearm, threatened to harm one or more people on social media.
Investigators identified the student and took them into custody before school hours at an off-campus location, according to police.
Officers also allegedly found a replica gun with an extended magazine while arresting the juvenile suspect.
The case is being reviewed by the Alameda County District Attorney's Office, police said.