Officer Jeffrey Gordon, son of Phoenix Mayor Phil Gordon, has been placed on leave from the city's Police Department pending an internal investigation.

The investigation "involves an allegation of inappropriate contact" while on duty, a police spokesman said Tuesday. The department declined to be more specific about the allegation or the investigation.

Jeffrey Gordon has worked for the department for six years and is assigned to the Central City Precinct. He is on paid administrative leave while the department's Professional Standards Bureau conducts the investigation.

The department said Police Chief Jack Harris has removed himself from the probe to avoid any suggestions of conflict of interest. Executive Assistant Chief Joseph Yahner is overseeing the investigation.