A man found his brother and two other men shot to death Tuesday at a rural home off Highway 116 between Forestville and Graton, Sonoma County sheriff's officials said.
The shooting appeared to be targeted, however investigators did not go into further detail about what transpired at a cabin toward the back of the Ross Station Road property. The shooter or shooters remained at large.
"This was not a random crime," Lt. Dennis O'Leary said. "I don't believe there is any danger to Sonoma County citizens or people elsewhere."
The man had not heard from his brother for several hours and went, with a girlfriend, to the property on the 9700 block of Ross Station Road near Douglas Lane to check on him, O'Leary said.
They found the bodies in a bedroom and the girlfriend called authorities at 3:13 p.m., he said.
Sonoma County sheriff's deputies, as well as ambulance and fire crews, flooded the narrow road.
The men were declared dead at the scene. There was no obvious signs of a struggle, O'Leary said.
A resident of the property, Ed Lark, returned home from work to find his driveway cordoned off and a crowd of law enforcement and television crews gathered on his normally quiet road. Lark said a friend alerted him to the shooting, but that he did not know more.
"The unknown is unnerving. I don't know what's going on," Lark said.
He said he, his landlord and others lived on the property.