Three children and a man were found dead on Saturday in a property in Staines-upon-Thames, a town in northwest Surrey, British police said.
Surrey Police officers were called by South-East Coast Ambulance service to the property at around 1:15 p.m. local time, where they found the bodies of three children and a man.
Surrey Police said an investigation is being carried out to establish the circumstances of their deaths.
At this stage, police believe it is an isolated incident with no third-party involvement.
Their next of kin are aware and will be supported by specialist officers, the police said.