Police say they have found four bodies in a home near Chicago.
Bullet shell casings were found near the bodies Wednesday, but authorities in suburban Addison would not give the cause of death. Addison Police Chief Tim Hayden said the victims are likely members of the family that lived at the residence.
The victims won't be officially identified until the DuPage County coroner completes autopsies Thursday.
Police spokeswoman Megan Freeman says a preliminary investigation indicates the deaths were not the result of a random act of violence.
Police say investigators responded to a 911 call from a woman. A woman was among the dead found in the home.
Hayden says the home's doors and windows were locked, forcing officers to break in.