District of Columbia fire officials received a report of sexual misconduct against a veteran sergeant more than a year before he was accused of a similar act that has triggered a broad investigation of alleged wrongdoing within the department, according to court documents.

D.C. police and fire officials this month launched a high-profile investigation into allegations of rampant sexual misconduct, including reports that as many as a dozen fire department employees were involved in a prostitution ring. The accusations surfaced last month after an emergency medical technician complained that former Sgt. Darryl Green, 42, masturbatedin her presence at the Engine 8 fire house in late July.