State police have detained and disarmed the entire police force of a town in western Mexico where a mayoral candidate was killed last week.
Video of the detention aired by local media showed uniformed officers hitting each other as gunshots go off in the background in the town of Ocampo.
The Michoacan state police force said: "All the officers of the Ocampo municipal police force were detained for internal affairs investigation."
In statements on its Twitter account, the state police department did not directly tie the detentions to last week's killing of Fernando Angeles Juarez, the mayoral candidate for the leftist Democratic Revolution Party.
In 2010, the mayor of the northern Mexico town of Santiago, Nuevo Leon, was killed by his own police in retaliation for his attempts to oust corrupt officers.