The lockout was ordered after threats against the school were placed on social media. Administrators said there was a brief investigation after a possible threat inside the building.
Lockout means the outer doors and the perimeter of campus has been secured.
Inside the school, however, it's business as usual with classes going on as scheduled.
A letter was being prepared for distribution to parents, according to officials.
We're following this story on Eyewitness News. Watch for updates on air, online and on our mobile news app.
Keep checking back on this page to get real-time updates as this story unfolds. To get alerts for breaking news, download the abc13 news app for iPhone or Android. You can also get breaking news alerts sent to you by email.