The entire police force in Ocampo, Mexico, was arrested by federal forces after the murder last week of a mayoral candidate.
Fernando Angeles Juarez, a businessman with little political experience, was killed outside his home by unknown gunmen on Thursday -- one of over 100 politicians killed in Mexico prior to general elections on July 1.
He was the third politician in just over a week in Michoacán state to be killed.
The police force and Oscar Gonzalez Garcia, public security secretary and supervisor, were detained by federal agents Sunday. When the agents arrived in Ocampo, they were stopped by local police officers.
The agents returned with reinforcements and detained the 27-person police force on suspicion of involvement in a murder.
The police officers were handcuffed and taken to Morelia, the state capital, where they were remanded to the custody of the internal affairs unit of Mexico's state security secretariat.
Prosecutors accuse Gonzalez and the police of links to organized crime.
Members of the Mexican army were called in to guard Angeles' funeral.
Over 3,000 elected positions are at stake in next week's vote, including those of president, senators, Chamber of Deputies posts and regional and local positions.