Police say one man may be behind a recent string of robberies in Lexington.
Four different clerks have come face to face with a man packing what may be a machine gun.
Police say there are similarities in the crimes.
On Monday, a man walked into the Big M Market off Bryan Avenue and robbed the clerk at gun point.
Two men barged into the Cricket Wireless store on Main Street last Thursday and robbed the woman at the register producing a large handgun.
Police say the gun may be the link to the crimes.
Investigators are trying to determine if the gun used in a recent robbery is the same one as in the others.
If you have any information, call Lexington police.