BOULDER COUNTY, Colo. (CBS4)– One person was arrested after a suspicious backpack placed Monarch High School on lockdown Thursday morning.

Brenton Church, of Superior was arrested for interference of staff, faculty or students of an educational institution, and attempted second-degree trespass.

Monarch High School (credit: CBS)

Church, 24, was arrested after Monarch High School, located at 329 Campus Dr. in Louisville, was placed on lockdown status.

Monarch High School (credit: CBS)

The lockdown was prompted by an unattended backpack was discovered. The Boulder County Bomb Squad was called to investigate and found nothing suspicious.

Monarch High School (credit: CBS)

Officers searched inside and outside of the school but found nothing suspicious.

Monarch High School (credit: CBS)