Police Scotland's chief constable has been granted "special leave" while two allegations against him of gross misconduct are investigated.

Phil Gormley said the latest complaint was raised by a member of the Force Executive, Police Scotland's senior management team.

The team comprises officers ranked at Assistant Chief Constable and higher, the force's deputy chief officer and the director of ICT.

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The Police Investigations and Review Commissioner (Pirc) confirmed on Friday it was investigating a new allegation of gross misconduct by the chief constable, in addition to one announced in July.

Both complaints were referred to the organisation following an investigation by the Scottish Police Authority (SPA), the oversight body for the force.

Mr Gormley, who denies both allegations, faced calls to temporarily stand aside when the initial complaint was revealed but remained in post until the second accusation emerged.

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He said in a statement: "I have been notified by the SPA of a complaint made against me. This complaint originates from a member of the Force Executive.

"In the interests of the office of Chief Constable and the broader interests of Police Scotland, I have sought and been granted special leave to enable this matter to be properly assessed.

"I deny and reject the allegations and will co-operate with the SPA's assessment and procedures. It is my intention to resume my full duties when this matter has been resolved."

No information was given regarding the nature either of complaint, but if a serious breach of standards is found, Mr Gormley could face dismissal.

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The SPA confirmed it had agreed to Mr Gormley's request for a temporary leave of absence and said this will be kept under review on a four-weekly basis.

Deputy Chief Constable Iain Livingstone will take over leadership of Police Scotland until further notice, the authority said.

Pirc said once each investigation is concluded it will submit a report to the SPA on whether the allegations should be referred to a misconduct hearing.

Scottish Liberal Democrat leader Willie Rennie called for Mr Gormley to stand aside when the first Pirc investigation was confirmed.

At the time, the SPA ruled that temporarily removing him from his post was ''not appropriate''.

Mr Rennie said: "It has taken too long but Phil Gormley has made the right decision to temporarily stand aside and I commend him on that.

"The investigation needs to be completed effectively and swiftly so that Police Scotland can move on.

"There is a lot to fix in Police Scotland and we need effective leadership to fix it."

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Scottish Labour's justice spokeswoman Claire Baker said Mr Gormley's decision "risks further damaging public confidence in Police Scotland".

She said: "The SNP government must immediately clarify what impact this will have on the already shaky management of Police Scotland."

Scottish Greens' justice spokesman John Finnie said the chief constable taking special leave was a "wise move".

He added: "While unsighted on the specifics, it's fair to say any workplace complaints present particular challenges, likely to be compounded in this case by issues of rank and location.

"The practice of separating complainer and accused may also have been insurmountable. The chief constable's decision, at this time, to stand aside during the investigation suggests there may be greater complexity than first reported."

Scottish Conservative justice spokesman Liam Kerr said: "Given the circumstances it is only right that Phil Gormley has temporarily stepped aside.

"To have the Chief Constable under investigation for gross misconduct is damaging not only to the reputation of the police force, but also its operation."