Some told reporters the interviews concerned contracts related to large public works projects.
Oxnard's mayor said the probe has, "caught him completely off guard."
The exact nature of the investigation has not been revealed.
FBI, Ventura Co. DA probe Oxnard City Hall
OXNARD, Calif. City Hall has been on lockdown since Friday when /*Ventura County*/ investigators rushed in and evacuated the building. On Saturday, investigators served search warrants, searched for records and interviewed top /*Oxnard*/ officials.
