The Council Bluffs Police Department is investigating an armed robbery of a convenience store this morning. The lone suspect entered the Casey’s located at 510 23rd Avenue armed with a black semi-automatic handgun and demanded money. After his demand was not met he fled the store on foot going east. The suspect is described as a white male, 5 feet ten inches tall, weighing 150-160 pounds. He was wearing a black hooded sweatshirt, black pants, black shoes, and a grey ski mask. No injuries were reported to the nine people in the store at the time of the robbery. Anyone with information is asked to contact the Council Bluffs Police Department at 712-328-S-T-O-P.