Michoacan's Attorney General's Office said in a statement Saturday that the seven bodies had bullet wounds and had been placed individually in the sitting position in chairs near a traffic circle in the city of Uruapan. The office did not provide a motive for killings.
In Guerrero state, authorities said armed men opened fire in a bar in Ciudad Altamirano late Friday. Four civilians and three off-duty federal agents were killed.
Both states on Mexico's western coast have seen a surge of violence in recent years attributed to drug cartels.