Polk County authorities say a reserve deputy's gun fired as she was preparing to turn it over to a firearms instructor for inspection.
The Des Moines Register reports that Reserve Deputy Donna Britt's left hand was injured when the gun fired inside the department's headquarters on Monday night.
Department spokeswoman Jana Rooker says it's unclear whether the bullet struck Britt's hand or the injury resulted from the gun recoil. Britt was treated at a hospital and released.
Reserve deputies carry county-issued firearms but don't make arrests. They must pass a firearms safety course as part of a reserve deputy academy.
Rooker says the accident is still being evaluated.