The Cambridge Police Department is investigating an armed robbery and report they now have a suspect in custody. It happened Wednesday at Secrest Carry Out at Steubenville Avenue and 1st Street. Detectives say the suspect demanded money from the clerk and fled the store on foot. The clerk described the suspect as a 20-year-old black male wearing a ski mask, gray hooded sweatshirt, blue jeans and white tennis shoes. Officers checked the area and located a male matching the description at a residence on Gomber Avenue. He is being held in the county jail. Anyone with information on the incident is asked to call Cambridge Police.