Bern cantonal police said in a statement that they were alerted at around 2am.
On arrival at the house they found the bodies of two victims, a 65-year-old man and a 61-year-old woman.
Initial investigations led police to assume they are dealing with a double murder.
According to newspaper 20 Minutes, it was the couple's dog who raised the alert, barking in the early hours of the morning.
A neighbour told the paper that the woman was a housewife and the man a fireman who had recently retired. They had a 23-year-old daughter.
Police are working with forensics and the Institute of Legal Medicine at Bern University to analyze the crime scene, where work is ongoing.
They are also seeing witnesses. Anyone with information should call Bern police on 032 344 5111.