Four people, including two children, were found dead Wednesday in a home in suburban Chicago in what police believe was a murder-suicide, MyFoxChicago.com reported.
Addison authorities are investigating the deaths of a man, woman and two boys discovered just after 6:30 a.m. Wednesday.
Officers went to the scene after getting a 911 call.
Police aren't providing details on how the people died or when they were killed.
"The preliminary investigation indicates this was not a random act of violence, but an isolated incident at this location," said Addison Police Officer Megan Freeman. She said it appears that no one outside the home was involved and neighbors shouldn't be concerned.
Another law-enforcement source told MyFoxChicago.com that the crime was being handled as a murder-suicide.
Autopsies are scheduled for Thursday.
The Associated Press contributed to this report.