A recent Elk Grove High School graduate who threatened violence against the school online, leading to a lockdown at the end of the school day Wednesday, is now in police custody, officials said.
Students were told to stay in their classrooms at dismissal time Wednesday afternoon in light of the social media posting by the former student.
"We are having students shelter-in-place at the end of the day today," Principal Paul Kelly wrote in an email to parents sent shortly after 3 p.m. "The students will be staying in their rooms until we receive the all clear from the Elk Grove Police Department."
About 3:30 p.m., Elk Grove police reported the suspect was located and taken into custody. Students were allowed to leave shortly thereafter.
Kelly said school officials learned of the social media post earlier Wednesday afternoon.
Police said they worked with school administrators to verify the validity of the post and the author's identity.
As a precaution, there was an increased police presence at the school.