MINNEAPOLIS (WCCO) — Minneapolis Police think the people responsible for three business robberies on the city’s south side over the weekend may now be involved in as many as six robberies.

Lt. Mike Fossum, who works with the Minneapolis Robbery Unit, said three more armed robberies happened on Tuesday between 7 and 9 p.m.

The first happened at 7:50 p.m. at a Subway Restaurant located at 2400 E. Hennepin Ave. The next took place at 8:15 p.m. when a woman was robbed on the street while she was going into her apartment building at 3450 Dupont Ave. S. The final incident on Tuesday happened at 8:50 p.m. at a Caribou Coffee shop at 4745 Cedar Ave. S.

Police think there might be a team involved  — one guy robs and the other drives the getaway car. Fossum said they may take turns driving, however.

Police believe the same gunman was involved in robberies that happened earlier in the week. On Monday, two robberies happened within just 15 minutes of each other, and another happened Saturday just before 7 p.m. at Caribou Coffee at 46th Street and Nicollet Avenue.

The Monday robberies happened at a Domino’s Pizza at 5957 Penn Ave. S. and the second at Bella’s Spa at 5015 Ewing Ave. S.

Fossum said there are some common factors that link the robberies to these people. First, they all happen around 7 to 9 p.m. and so far, all but one incident took place in South Minneapolis. The gunman in all incidents was dressed in black and wore a mask. Police also said the victims are usually female.

The suspect is described as a black man, 20 to 30 years old, between 5-foot-3 and 5-foot-7, wearing a black face mask, black ski jacket, hooded sweatshirt and black pants. He was also wearing black gloves and was armed with a silver semi-automatic handgun.

No one was hurt in any of the robberies, but there is concern that things will escalate.

Police are investigating and said there may be surveillance video in the Subway robbery. Anyone with information should call the Minneapolis Police Department tip line at (612) 673-3645.