Detectives are investigating the deaths of a 66-year-old man and 48-year-old woman following an incident in Forest Town, Mansfield, last night (Tuesday 28 August).
The pair, who are believed to be known to one another, were treated by ambulance crews but were both pronounced dead at the scene a short while later.
Enquiries are ongoing and officers are still trying to establish whether anyone else was involved.
Police have cordoned off Tall Trees Caravan Park at Forest Town.
A spokesman for East Midland ambulance Service said: “We received a call at 9.59pm on 28 August to a private address in Forest Town, Mansfield. The caller reported that two patients were experiencing life-threatening medical emergencies. We sent a paramedic in an ambulance car and a crewed ambulance to the scene.”