Authorities say the bodies of seven men were found in plastic chairs placed along the side of a street in the drug-plagued Mexican state of Michoacan, while another seven people, including three federal agents, were killed in neighboring Guerrero.

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.