The Contra Costa County Sheriff's Office said they're investigating a possible murder-suicide.
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The call came in at around 5:20 p.m. with dispatch audio indicating it was a welfare check at a home.
Several officers were on scene taping off the residence.
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A statement put out by the Contra Costa County Sheriff's Office said officers entered the residence and found three bodies: an adult and two juveniles. The fire department confirmed all three to be deceased.
The adult is identified as 44-year-old Nemanja Isailovic of Danville.
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Long-time resident Mike Quinata said he's in shock and is still processing something like this happening so close to home.
"This is shocking to the neighborhood, I have kids here..." Quinata said. "As far as processing, you really can't process it because I don't think we've even had anything as far as murder-suicide."
INTERACTIVE: Take a look at the ABC7 Neighborhood Safety Tracker
The Contra Costa County Sheriff's Office said there's no threat to the public - but did not say if there had been any arrests.
Investigators say more information will be released at a later time.
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The sheriff's office says it is still actively investigating the case.
Anyone with any information on this incident is asked to contact the Investigation Division at (925) 313-2600 or through sheriff's office dispatch at (925) 646-2441. For any tips, email: tips@so.cccounty.us or call (866) 846-3592 to leave an anonymous voice message.