A 33-year-old man and 30-year-old woman were found at the scene.
A 64-year-old man from Brighton has been arrested on suspicion of murder.
Police have cordoned off part of a graveyard next to the house where the incident occurred.
Det Ch Insp Kimball Edey said that the investigation is in its early stages and that there will be an increased police presence in the area.
LONDON DAILY ARCHIVE
Two Found Dead in Sussex, UK: 33-Year-Old Man and 30-Year-Old Woman Discovered at Lewes Road Address
A man and a woman were found dead at an address in Lewes Road, Newhaven, East Sussex, UK, on Friday night.
10 June 2023 · 22:50 UTC
