WEST BEND, Wis. (CBS 58) -- West Bend police are investigating after the discovery of a "concerning device" among donated items at St. Vincent de Paul. 

CBS 58

The police department received a call just before 1:30 p.m. Tuesday after employees located an item they believed to be a possible grenade. 

The store was temporarily closed while the Milwaukee County Bomb Squad responded to evaluate.

Police say the item was determined to be a "flash bang device," designed to create a bright flash of light and loud noise when deployed. 

Officials are investigating how this item ended up in the local donation pile. Anyone who encounters a suspicious device or unknown military-related item is asked to contact their local police department and avoid touching or handling it.  

Anyone with information is asked to contact West Bend police at 262-335-5000.