By CBS3 Staff

PHILADELPHIA (CBS) — A Philadelphia elementary school was in lockdown Thursday after a staff member left a gun in their jacket. A School District of Philadelphia spokesperson said it happened at Henry A. Brown Elementary School.

The district says a staff member found the firearm inside of a pocket that was left in an office away from students.

READ MORE: 5-Year-Old Boy Injured In North Philadelphia Shooting, Police Say

The school went into lockdown at 12:05 p.m. following district policy.

READ MORE: EXCLUSIVE: Teen Pilot Who Landed Plane On Bridge In Ocean City Shares How He Survived New Mexico Plane Crash

“The possession of weapons and firearms is prohibited from being on any district property regardless of whether the individual has a license to carry,” the school district spokesperson said. “The staff person who owned the jacket was removed from the building by PPD, and the incident is being handled in accordance with District policy.”

Philadelphia police recovered the weapon and declared no imminent threat to students and staff and the lockdown was lifted at 12:20 p.m.

MORE NEWS: Police: 4-Year-Old In Stable But Critical Condition After Being Struck By SUV In West Philly

The school resumed its normal day after.