Columbia police are working to solve a string of armed robberies that have occurred during the month of July. The first incident was reported on July 4 at the Quik Mart located at 2708 Trotwood Avenue. According to police, the single offender entered the store wearing a grey t-shirt, black jeans and a hospital mask. The suspect is said to be around five feet, nine inches tall and weighs between 160 and 190 pounds. He also is believed to have a dreadlock type of hairstyle. The second armed robbery was reported days later on July 14 at the Tobacco Outlet located at 1408 Nashville Highway. Police reported two men were involved in the incident. One of the suspects is believed to be around six feet tall with a thin build. He was wearing a black hooded sweatshirt and blue jeans at the time of the crime. The second suspect is said to have a medium build and was seen wearing a grey sweatshirt with orange writing. On July 25, police reported the Zip Mart at 101 Santa Fe Pike was robbed by two offenders. Police said one of the men was wearing black jeans, a black hooded sweatshirt and had a black bandana over his face. He was also carrying a backpack. The second suspect was also wearing black jeans, a grey hooded sweatshirt and had a black bandana over his face. Both men are said to have a thin build. The Dollar General located at 2490 Nashville Highway was robbed on Saturday. Police reported the two suspects used bandanas and t-shirts to cover their faces during the crime. Both offenders are said to be around six feet tall. The most recent incident occurred on Monday night around 8:45 p.m. at the Tobacco & Beer located at 1390 Hampshire Pike. Police said one of the suspects is around five feet, 11 inches tall with a thin build. He was wearing all black at the time of the robbery. The second suspect is around five feet, six inches tall with a medium build. He was last seen wearing all black and was using a white, half face mask. The pair is said to have fled on foot before getting into a light colored vehicle. Authorities believe the crimes could be related. Anyone with information is urged to contact Crime Stoppers at 931-381-4900.