(WATERTOWN TOWNSHIP) -- The Sanilac County Sheriff's Department says a person of interest in the armed robbery of the Depot Party Store in Watertown Township has been arrested and is being held in the Sanilac County jail on unrelated charges. Sheriff Garry Biniecki says a citizen's tip was instrumental in the arrest. "I'm hoping that with this arrest and the direction the investigation is taking, the Citizens of Sanilac County can again feel safe and secure", stated Sanilac County Sheriff Garry Biniecki. The sheriff says the investigation has to be worked through, but he feels confident the right man has been arrested. The female person of interest has been identified and interviewed, but has not been charged at this time. Anyone with information on any crime is encouraged to contact the Sanilac County Sheriff's Office Detective's Bureau at 810-648-8360. Information may also be provided at the Crime Stoppers Tip line at 1-800-SPEAK-UP. Rewards are available and you may remain anonymous.