At least 23 people died in drug-related violence in three Mexican states, officials said.
An abandoned SUV containing five dismembered bodies was found on a road in the northern state of Coahuila.
The body parts were packed in 25 trash bags, Coahuila Attorney General's Office spokesman Fernando Olivas told EFe.
The victims' remains were discovered Sunday night by police responding to an anonymous tip that an SUV had been abandoned on a busy road in the city of Torreon, Olivas said.
Two other dismembered bodies were found in the city's Las Margaritas district, Olivas said.
The heads were left in some buckets and the bodies were found at another site along with a message from a criminal organization, the AG's office spokesman said.
The bodies of two men were dumped in front of a church in Torreon, Olivas said.
The men had been bound and shot in the head, the AG's office spokesman said.
Torreon is in the La Laguna region, which includes parts of Coahuila and neighboring Durango state.
The region is the object of a bitter turf war between the Los Zetas and Sinaloa drug cartels.
Los Zetas controls Coahuila's largest cities, including Saltillo, the state capital, Torreon and Piedras Negras.
Authorities in the southern state of Guerrero, meanwhile, found eight bullet-riddled bodies.
Five of the bodies were discovered in Taxco de Alarcon and the rest in the city of Zihuatanejo, the Guerrero Attorney General's Office said.
No arrests have been made in connection with the killings, the AG's office said.
The remains of six people were found in five clandestine graves in the western state of Michoacan, officials said.
The clandestine graves are in Benito Juarez, a city in the eastern part of Michoacan, state police said.
Two bodies were found in one of the clandestine graves, while the others contained one body each, police said.
The decomposing bodies had all been dismembered and have not been identified, police said. EFE