THORNTON, Colo. -- The lockout has been lifted at Thornton High School and the Bollman Technical Education Center, police said.
Thornton Police told Denver7 the lockout was put in place after a report of a disturbance. Investigators said an adult man threatened a teacher at the Bollman Technical Education Center.
Police said they searched the school, but the suspect got away.
Adams 12 Five Star Schools website said lockout means "School administrators, faculty, and staff move all students and activities inside and ensure the building perimeter is secured - building and windows locked."
Read more about Adams 12 safety protocols on the district's website.