A murder investigation has been launched after a woman was found dead at her home address in Twickenham, and her husband and two children died in East Sussex.
Police were called at approximately 17:54hrs on Monday, 5 March to South Road, TW2 following concerns raised about the welfare of the occupants.
Officers attended along with London Ambulance Service.
A woman aged 47 was found dead at the scene with stab injuries.
Detectives quickly sought to establish the welfare of her husband, aged 57, and two children aged 7 and 10, and carried out a number of urgent enquires.
Just before 17.00hrs, the bodies of a man and two young boys were discovered at Birling Gap seafront, East Sussex. Sussex Police later contacted the Met.
Whilst formal identification awaits, police believe that they are the deceased woman’s immediate family.
A vehicle was recovered nearby by Sussex Police. A crime scene remains in place at the Twickenham address.
Officers from the Met's Homicide and Major Crime Command are leading the investigation, supported by colleagues in Sussex Police.
Post-mortem examinations for all four individuals will take place in due course. Formal identification awaits.
Next of kin have been informed. No arrests have been made. Enquiries continue.
At this early stage, police are not looking for anyone else in connection with this investigation.
Anyone with information is asked to call the Metropolitan Police on 0208 721 4005, or locally to Sussex Police on 101 quoting Operation Glasson.
You can also call Crimestoppers anonymously on 0800 555 111.