LINCOLN -- The search is on for the knife-wielding robber who stole money late Sunday night from the Shop EZ convenience store at 70th and Colfax. A K-9 unit was brought in to help track down the robber, but was unsuccessful. Lincoln Police Capt. Michon Morrow tells KFOR NEWS the clerk describes the robber as a black man, 5-5 with a muscular build. He wore a black mask over his face, black gloves, a black and red jacket and black athletic-style pants. Morrow says no one was hurt in the robbery.