CHICAGO , Illinois ( CNN ) -- A clerk 's quick flip of a switch foiled a robbery Friday at an Office Depot store in downtown Chicago . Police said a man wearing a light blue button-down shirt and dark slacks entered the store carrying a gun concealed in a folded newspaper . He approached one of the store 's cash registers and demanded the contents of the safe , police said . The clerk refused but immediately turned on the public address system so that other customers could hear what was going on . Hearing his threat broadcast throughout the store , the man fled . He ended up robbing a nearby Fannie May candy store at gunpoint , police said , and fled that store in a white taxi . Authorities said the robber , a man between ages 30 and 40 , was still at large . No injuries were reported in either robbery .
Store clerk switches on PA system after being threatened by man with gun . Armed robber flees after hearing his threat broadcast to customers in the store . Comment: Authorities say the robber , a man between ages 30 and 40 , is still at large .