The Chief Constable of Cheshire Police is being investigated following an allegation about his conduct.
Cheshire Police and Crime Commissioner David Keane has ordered an independent inquiry into the claim surrounding Simon Byrne which will be carried out by another force.
The nature of the allegation has not been disclosed.
In a statement, Mr Keane said: “I can confirm that I have received an allegation against the Chief Constable, Simon Byrne.
"In the interest of openness and transparency, I referred this immediately to the Independent Police Complaints Commission (IPCC) who have now passed this case back to me for a local investigation.
"This investigation will be conducted independently of Cheshire Constabulary in accordance with the statutory police complaints process."
Chief Constable Simon Byrne said: “I am aware that an allegation about my conduct is being investigated by the Police and Crime Commissioner for Cheshire, in accordance with normal policy and procedure.
"I do not know the detail of the allegation so am unable to make any further comment at the moment. In the meantime, I remain focused on my work in keeping Cheshire safe and fulfilling my national responsibilities.”