Milwaukee Police are investigating a strong-arm robbery that happened at about 1:45 p.m. on March 13 at M&R Locksmith located 600 W. Lincoln Avenue. Three suspects entered the store and one of the suspects struck an employee with his fist. The suspects then forced the employee to the floor and attempted to remove money from the cash register, however the suspects fled the store without obtaining any property. The three suspects are described as Hispanic males in their late teens or early 20's. The video shows the suspects as they walked away from the store. Anyone with information on the identity of the suspects is asked to call Milwaukee Police at 414-935-7360.