A senior police officer has questioned how media knew about raids on Craig Thomson's house before warrants had been executed.
Detective Superintendent Brett Guerin of Victoria Police's serious crime operations said he was outraged that information about the joint raids with New South Wales police had been leaked.
NSW police issued a statement earlier today saying it was not their policy "to alert media to such activity and no officer from NSW was authorised to do so".
Detective Superintendent Guerin did not blame anyone for the leak, but said having a media pack outside the NSW Central Coast home of the embattled Labor MP had compromised police safety.
Mr Thomson's lawyer, Chris McArdle, had earlier voiced his anger at the media's knowledge of the raids.
"I share Mr McArdle's outrage at the media's apparent knowledge of these activities this morning," Detective Superintendent Guerin said.
"The last thing our detectives need is to be knocking on someone's door with a media scrum watching. It helps no one but the media.
"Victoria Police is very conscious of the high-profile nature of this investigation and has been resolute in the information they have provided to the media. I would love to know how the media knew what was happening."
Police raided the Bateau Bay home of Mr Thomson and his wife Zoe just after 7am this morning.
Mr Thomson later emerged to tell reporters he had fully co-operated with police and was "very confident that at the end of this investigation I will be vindicated".
NSW police obtained the warrant on behalf of the Victorian police, who are investigating allegations that Mr Thomson improperly used Health Services Union funds to spend on prostitutes, air travel, entertainment and cash withdrawals in excess of $100,000.
Shortly after 10am about eight officers walked out of Mr Thomson's house with a five large sealed boxes of material.
Police also executed a search warrant on Mr Thomson's electoral office in nearby Tuggerah.