Scotland’s Justice Secretary has refused to say if the Government knows the identities of police officers investigating the SNP’s finances.

Police Scotland launched Operation Branchform to examine the party’s use of funding and has charged former chief executive – and the husband of Nicola Sturgeon – Peter Murrell in connection with alleged embezzlement.

Ms Sturgeon and former party treasurer Colin Beattie were both arrested last year but released without charge, pending further investigation.

The former first minister told the PA news agency in December she knows “nothing more” about the investigation.

Scottish Conservative MSP Craig Hoy raised the investigation in the Holyrood chamber on Wednesday, quizzing Justice Secretary Angela Constance on whether the Government knows the identity of the 11 officers who are part of the investigation.

Conservative MSP Craig Hoy raised the issue in Holyrood (Andrew Milligan/PA)

A freedom of information request asking if and when the Government had been made aware, along with how it had been given the details, Mr Hoy said, had been rejected because it would “substantially prejudice” the probe.

“Which strongly suggests the Government may well be aware of those facts,” he said.

“So can the minister explain why revealing the specific date when officers’ identities could have become known would risk prejudicing the police probe, and if the Government has nothing to hide, why would it not confirm how they may have secured the identities of the investigating officers, if indeed it is in receipt of them?”

Following a warning from Deputy Presiding Officer Anabelle Ewing that the case is live and subject to contempt of court legislation, Ms Constance replied: “Presiding Officer, with respect to both yourself and the chamber, as the member is well aware, as Justice Secretary, I do not comment and I am not involved in live cases and I have nothing further to add.”