Lexington police are investigating an armed robbery at a Walgreens. Officers said three men walked into the Walgreens on Richmond Road just after midnight Sunday. One had a gun and got an undetermined amount of money from the register. It happened just a few minutes down the road from a Verizon store that was robbed Friday night. However, the police do not believe they are connected at this time. Police are still looking for suspects in both robberies.