Columbia Police are investigating armed robberies at Arena Wine and Spirits on Scott Boulevard and Arena Liquor on Corporate Lake Drive. They happened at around 9:40 and 10:25 Monday night. In both cases, a man entered the store with a handgun and demanded money. He was dressed in all dark clothing and left in a dark-colored, four-door sedan. Anyone with information should call the Columbia Police Department at 573-874-7652 or CrimeStoppers at 573-875-TIPS to remain anonymous.