Police were looking into the possibility that as many as four robberies that took place Wednesday evening and overnight could be connected.
Chief of Detectives Dennis Richards said there are some similarities between at least two of the cases and that an investigation is under way.
The incidents took place within a small area, between Grant Street and Main Street and West Delavan Avenue and North Street.
All of the cases involved at least two suspects. Three of the incidents involved guns and the victims getting hit in the head. And victims were made to lie on the ground in three of the holdups.
The first incident took place at 5:45 p.m. at Enterprise Rental at 1312 Main St. Two men wearing all dark clothing with hoods and white cloths across their faces entered the car rental office and demanded that everyone inside get on the floor.
One of the robbers, who was holding a gun, hit the victims on the head and demanded money from the office safe. The robbers also stole cash from two employees before fleeing south on Main Street.
Then at 6:58 p.m., workers at H&R Block at 260 Elmwood Ave. reported that three men, two of them armed and one wearing a black mask, entered their office.
One robber showed a handgun and hit an employee on the head, then forced the employee to remove $50 from a drawer. That man then ordered the victims to lie down. The second robber then took a worker's wallet, which contained $400 in cash. They were seen fleeing east on Summer Street.
At about midnight, a man walking on Auburn Avenue near Grant Street was approached by two men, one of whom grabbed him by the arm and said: "Come with us. We won't hurt you."
The two forced the victim to an area between two houses on Auburn where he was instructed to lie down on the ground for 30 seconds. They took the victim's wallet and before fleeing.
Then at 12:15 a.m., another pedestrian reported he was robbed by two men who displayed a silver handgun and demanded cash. One hit this victim in the face and took $200 and the victim's keys before fleeing with two other men on foot.