Three more people have been arrested by police trying to track down a stolen solid gold toilet.
Detectives are still looking for the artwork, valued at $6m (£4.8m), which was taken in a raid at Blenheim Palace in the early hours of 14 September.
A 35-year-old man, a 34-year-old man, and a 36-year-old woman, all from Oxford, have been arrested on suspicion of conspiring to commit a burglary.
Two men have previously been arrested on suspicion of burglary.
A 66-year-old man from Evesham arrested on the same day as the theft was released on bail, and a 36-year-old man from Cheltenham was released under investigation.
The latest three to be arrested remain in police custody.
The palace's insurance company Fine Art Specie Adjusters said up to £100,000 could be paid out as a reward for the luxurious loo's safe return.
The working toilet, entitled America, was part of an exhibition by Italian conceptual artist Maurizio Cattelan , and visitors had been invited to use it.
The burglary caused "significant damage and flooding" because the toilet was plumbed into the building, police said.
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The 18th Century stately home in Woodstock, Oxfordshire, is a World Heritage Site and the birthplace of Sir Winston Churchill.
Speaking in August , Edward Spencer-Churchill - half-brother of the current Duke of Marlborough - said he was relaxed about security for the artwork.
"It's not going to be the easiest thing to nick," he said.