A shutter assembly having at least one shutter and a security bar device for locking closed and providing additional rigidity to the shutter when covering an opening in a dwelling. The bar device has an elongated member preferably engaged releasably to the dwelling in the opening. The member traverses the opening and prevents the shutters from collapsing into the opening when closed. A retention bracket co-extends with and is spaced from the member with a portion of the shutter layered there-between when in the closed position. As such, the retention bracket prevents the shutter from opening when in the closed position. A locking portion of the retention bracket projects laterally to releasably engage the member.