Two police officers from the West Midlands are being investigated following allegations of gross misconduct and fraud.
The inquiry is being handled by Merseyside Police who said it centres on three officers from two different forces plus a member of the public.
The force said in a statement: "Merseyside Police can confirm that Chief Constable Jon Murphy is conducting an investigation into a Leicestershire Constabulary officer, two officers from West Midlands Police and a member of the public following allegations of gross misconduct and fraud.
"The investigation is currently ongoing so it would be inappropriate to comment further at this time."
Leicestershire Police Authority confirmed the suspension from duties of Leicestershire Constabulary's Temporary Deputy Chief Constable Gordon Fraser.
It said: "This follows on from an allegation received in relation to a business interest connected to Mr Fraser.
"This is now an ongoing investigation and therefore further details cannot be given at this time."
West Midlands Police said: "We can confirm that two officers from West Midlands Police have been suspended from duty. They were suspended on Monday, December 6.
"This follows an investigation into allegations of fraud and gross misconduct; this is in connection with a business interest of the officers.
"The investigation is ongoing and is being carried out by Merseyside Police."