MILWAUKEE (CBS 58) -- The Milwaukee Police Department says a member of the department was arrested Wednesday, March 12, following "significant allegations of criminal misconduct."

MPD says the officer resigned from the department at that time, after nearly 10 years of service. 

In a statement Friday, the police department said, in part, "Milwaukee Police Chief Jeffrey Norman expects all members, sworn and civilian, to demonstrate the highest ethical standards in the performance of their duties and was extremely disappointed to learn about the misconduct in this case."

An investigation led by the FBI is open and ongoing.

MPD says they are acting in full cooperation.