Clarksville police are investigating after a man robbed a cell phone store Saturday. Police said the man entered the Boost Mobile store on Fort Campbell Boulevard and demanded money. The man, who held his hand in his jacket as if he had a weapon, fled the scene on foot after receiving an undisclosed amount of cash. The suspect is around five feet, eight inches tall and was wearing a black shirt and jacket at the time of the robbery. Police are requesting anyone with information to call 931-648-0656 or Crime Stoppers at 931-645-TIPS.