(CBS) — Three people were found shot to death inside a Joliet home Thursday afternoon, and investigators believe they were killed the night before.

Police were called to the 1900 block of Great Falls Drive around 3 p.m., and found three people dead from apparent gunshot wounds.

Investigators believe the victims were shot Wednesday night during or after a party at the home, but have not yet determined who killed them or why.

Neighbors said they didn’t hear anything loud at the party in question. Police confirmed they never received any noise complaints.

“We think around 4 o’clock in the morning – it was when a lot of dogs started barking – could’ve been when it happened, but nobody heard anything,” neighbor Brad Guethle said.

Joliet Police Chief Brian Benton said police don’t believe the killings were random.

“We’ve talked to several of the neighbors, but they’ve all been very helpful with us, and we’re trying to backtrack now with the information they’ve given us. It’s going to all be part of the investigation. Again, our goal is to try to identity everybody that was here at the house,” Benton said.

The names, ages, and genders of the victims have not been released.

Neighbors said a mother and son lived at the home at the center of the investigation.

“I’m still in shock. I can’t believe this is happening two doors down. I mean, it’s just, you can’t think of it,” Brenda Guethle said. “You know, we all have our kids, you know? What’s going on?” she said.

Investigators were asking for the public’s help. Anyone with information was asked to call investigators at 815-724-3020.

Watch & Listen LIVE