United Kingdom, May 28 -- A building on Princess Diana's childhood estate has been targeted in an apparent arson attack.

The late royal's brother Earl Charles Spencer has confirmed a farmhouse at the family's Althorp House estate in Northamptonshire, UK - where Diana lived from the time of her parents' divorce until she married King Charles in 1981 - was set on fire.

Earl Spencer wrote on his Instagram Story: "Stunned to learn that one of @AlthorpHouse's farmhouses - fortunately, unoccupied at the time - was apparently burnt down by vandals last night.

"Sincere thanks to @northantsfire for trying to save it."

He added on X: "So very sad that anyone would think this a fun thing to do."

In a statement to PEOPLE magazine, Northamptonshi...