Suspects held up two people at gunpoint inside their garages in separate weekend incidents in Dyer and Schererville, police said.
Police believe the incidents may be related, as well as a third reported armed robbery of a group of three people on Friday at an ATM machine in Schererville.
Nobody was reported injured in the robberies.
A resident of Mackinaw Place in Schererville told police he'd pulled his car into the garage at about 8 p.m. Sunday when two men entered the garage.
One suspect pointed a silver revolver at the victim and demanded his wallet and cellphone, Schererville police Cmdr. Brian Neyhart said. The second suspect got into the vehicle passenger side, he said.
Both suspects left the area in a dark colored Chevrolet Cavalier, Neyhart said.
At about 7:30 p.m. Sunday, in Dyer, a resident of Lancelot Lane told police she was in her garage when two men approached, Dyer police Cmdr. Joe Cinko, said.
One of the men pulled a handgun and demanded the woman give him her purse, Cinko said. The victim complied, and the suspects ran off, Cinko said.
A police search of the area determined the suspects likely ran to a waiting vehicle and fled the area, Cinko said.
On Friday, three people told Schererville police they were robbed at gunpoint at an ATM machine at Chase Bank, 1801 Kennedy Ave., Schererville.
The victims, two age 20 and one 19, told police they'd pulled up to the ATM in a single vehicle at about 8 p.m. Friday when a man walked up to the driver's side and demanded the cash retrieved from the machine, Neyhart said.
The suspect then told one of the victims to cash out his bank card at the ATM, Neyhart said. When the bank card wouldn't work, the suspect told the victims to leave and threatened them with a black semi-automatic handgun, Neyhart said.
The suspect in the Friday incident was described as a black male, about 5 feet 8 inches tall, in his mid-20s, with a mustache and goatee and wearing a gray hooded sweatshirt.
The three incidents are believed to be related, Neyhart and Cinko both said.