Fairview High School went on lockdown for 15 minutes this morning after a report of someone putting on a bulletproof vest near the school, but that lockdown actually occurred five to six minutes after police determined the man putting on the vest was a Boulder County sheriff's cadet.

Boulder police spokeswoman Laurie Ogden said police began receiving reports at 9:45 a.m. of a man putting on a bulletproof vest near Fairview High. But Ogden said the man was actually a Boulder County Sheriff's Office cadet, and called dispatchers at 9:48 a.m. when he started getting "strange looks."

Dispatchers aired that the cadet was attending the 20-year memorial service for Boulder police Officer Beth Haynes at the department's headquarters. Haynes was killed in the line of duty on April 16, 1994.

Boulder Valley School District spokesman Briggs Gamblin said Fairview went on lockdown -- which means the students were sent into classes and the doors locked -- from 9:55 to 10:10 a.m.

Contact Camera Staff Writer Mitchell Byars at 303-473-1329, byarsm@dailycamera.com or twitter.com/mitchellbyars.