Police seek parliament help in inquiry

Officials from the department in charge of Parliament House have been assisting federal police with an investigation.

An AFP spokesman confirmed on Monday the agency had been "conducting inquiries with the Department of Parliamentary Services in relation to an ongoing investigation".

However, the spokesman dismissed reports that a search warrant had been executed on an MP's office in the past fortnight - nor had officers approached any MP to voluntarily obtain documents.

It is unclear who is the target of the police inquiry.

Shadow attorney-general Mark Dreyfus asked Speaker Tony Smith in parliament on Monday whether the department had assisted the AFP with accessing parliamentary records, including those held on computers.

"If so, could the Speaker please advise what assistance was provided and when?" Mr Dreyfus asked.

Mr Smith told parliament he did not comment on police matters.

"Any queries concerning such matters should be directed to the Australian Federal Police," he said.

But the Speaker added there were national guidelines for the execution of search warrants where parliamentary privilege might be involved.

"Any process for the execution of search warrants in circumstances where parliamentary privilege may be involved would only be done in accordance with principles of those guidelines to ensure that parliamentary privilege is protected."

AFP officers are warned in the guideline: "It can be a contempt of parliament for a person to improperly interfere with the free performance by a member of the member's duties as a member."

The AFP is known to be investigating a number of MPs in relation to the Peter Slipper-James Ashby case.

But the coalition MPs involved in the case - Mal Brough, Christopher Pyne and Wyatt Roy - all rejected any suggestion their parliamentary offices had been raided.

Another coalition MP, former minister Stuart Robert, has been referred to the AFP by Mr Dreyfus over whether there was any criminality involved in his dealings with a Chinese mining company.

Mr Robert told AAP on Monday his office had not been raided.