Baltimore's police union says the officers charged in Freddie Gray's death aren't to blame.

Baltimore City Fraternity of Police President Gene Ryan issued a statement today calling for an independent prosecutor in the case.

State's Attorney Marilyn Mosby announced today that Gray's death had been ruled a homicide. Six officers are facing charges, with one being charged with second-degree murder.

Ryan questioned Mosby's objectivity in the ruling and claimed each officer "diligently balanced their obligations" to protect both Gray and the public.

Gray died after suffering a severe spinal injury while in police custody, sparking citywide protests and riots this week in Baltimore.  (Metro Networks Inc.)