Surrey Police is investigating the deaths of Lisa Anthony and her daughter Ava, who were discovered dead at a house in Esher, Surrey.
Officers attended a property at the gated neighbourhood of Simmons Gate at around 10am on Sunday 28 June after concerns were raised for two people at the property. On arrival, the bodies of a woman in her forties and a teenage girl were discovered.
Although formal identification has not yet taken place, officers believe the deceased are Lisa, 47, and her daughter Ava, 14, who were residents at the property.
The two deaths are being linked to the death of man in his fifties on the same day in the Aix en Provence area of southern France, and UK officers are working alongside the French Gendarmerie as part of their investigation. The deaths have also been reported to the Surrey Coroner.
The senior investigating officer, detective chief inspector Mark Preston, said: "This is a tragic incident where lives have been lost and our thoughts are with their family and friends at this time.
"We are in the very early stages of the investigation but we do not believe there to be any threat to the wider community and I would like to reassure the public that this is thought to be an isolated incident. We are not currently looking for anyone else in connection with the deaths."
Officers are making a number of enquiries in the area and ask anyone with information which may assist their investigation to contact Surrey Police quoting Operation Caribou.