thames valley police
The victims have been named locally as 17-year-olds Dom Ansah and Ben Gillham-Rice.
Two men were also injured in the incident.
The fully-functioning toilet, titled "America", had been plumbed in for visitors to use in a wood-panelled room in Blenheim Palace.
A 15-year-old was killed on Saturday night.
A 15-year-old boy was stabbed to death in a separate incident in Slough just hours later.
The 28-year-old died from multiple injuries after being dragged under a vehicle.
A man has been arrested, but the golden toilet itself remains missing.
Hassan Akhtar, a former mosque chairman, was sentenced to eight years in prison at Reading Crown Court.
Two teenagers are believed to have died after suspected drug overdoses, one at Leeds festival and another at a nightclub in the city.
Both the pilot and the passenger were pronounced dead at the scene near the village of Stonor.