Irish show jumper Cian O'Connor has accused unnamed enemies of trying to destroy him amid the doping controversy which is threatening his Olympic title.
Ireland's equestrian federation said on Tuesday that a batch of documents had been taken in a break-in at its office.
Earlier this week it was revealed a test sample from the horse at the Olympics had been stolen in England.
"This looks like some individuals would go to any lengths to see me destroyed," O'Connor told the Irish Times.
O'Connor won the show jumping gold at the Olympics in August but last month the Equestrian Federation of Ireland (EFI) said his horse, Waterford Crystal, had failed an initial dope test.
The Irishman reiterated his denial of any wrong-doing, and said he still hoped further testing would prove his innocence.
"I would have no will or motive either to destroy the 'B' sample or to take anything from the EFI," he told the paper.
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I will comment on the medication with my vet when the matter is complete
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He refused to comment on allegations aired by Irish state broadcaster RTE that Waterford Crystal and a second of his horses, ABC Landliebe, had tested positive for a human drug used to treat schizophrenia.
"I don't have any hassle with discussing the issue but I'm going on the advice of my legal people.
"I will comment on the medication with my vet when the matter is complete," he said.
News of the burglary at the EFI offices in county Kildare came hours after the international governing body of equestrianism (FEI) said part of the horse's 'B' sample was stolen en route to a laboratory near Cambridge last month.
The FEI said only part of the 'B' sample had gone missing and the federation was "proceeding with the medication control case of Waterford Crystal".
The documents stolen from the Equestrian Federation of Ireland were linked to the ongoing doping scandal surrounding O'Connor's medal-winning horse.
Meanwhile, the Irish federation has revealed that a blood sample taken from Waterford Crystal at the Olympics will be tested at a laboratory in New York, and not Hong Kong, as had been indicated earlier this week.
Both urine and blood doping tests were conducted in Athens.
O'Connor's solicitor Andrew Coonan said they were contemplating legal action following the latest
development in the scandal.
"We had understood the testing would take place this Friday in Hong Kong," Mr Coonan said.
He said they had arranged for an analyst to travel to Hong Kong to oversee the testing at "considerable expense" and he had just managed to stop him
travelling.
"There was no reason given and it is despite the fact that on three occasions they have given us written confirmation it was going to Hong Kong," added Mr Coonan.
Testing of the sample will commence on 8 November.