MILL VALLEY, Calif. (AP) - Authorities are investigating the deaths of two men in neighboring backyards in Northern California.

Marin County Sheriff's Lt. Doug Pittman says investigators believe the deaths in an unincorporated part of Mill Valley are related and are treating them as a double homicide.

Detectives were looking into the shooting death of the first man late Wednesday when they discovered the body of a second man also shot in an adjacent yard early Thursday morning.

Investigators also found a rifle alongside the second body.

Pittman says some witnesses recall hearing as many as two shots Wednesday afternoon. He says investigators are not looking for any possible suspects.

The names of the victims have not been released.

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