But homicide Staff Sgt. Doug Andrus says investigators don't have any suspects they can name publicly yet.
Nathan O'Brien and Alvin and Kathy Liknes were reported missing Monday and police believe their disappearance is suspicious.
Nathan had been at a sleepover after the couple held an estate sale at their home on the weekend.
Andrus says officers have closed-circuit video from homes and business near the Liknes' house and it's helping with the investigation.
He says police are also getting information from the public, including the people who attended the estate sale that were asked to come forward.