PHOENIX (KSAZ) - Police say they are investigating a threat made at a valley high school.
The Phoenix Police Department tells Fox 10 they investigating a threat "written on a wall" at Central High School. Police are reviewing surveillance tape and interviewing students are part of their investigation.
A "Shelter in Place" has been put in effect at the school, which keeps students in their classrooms and does not allow anyone to enter or leave the campus.
The school says parents have been notified of the ongoing incident via phone messenger.
This is a developing story. Stay with Fox 10 News for updates.