At least 22 people, including six women, died in violent incidents across Mexico this weekend, officials said.
The bodies of four women were found in Morelos, a state in central Mexico, state prosecutors said.
The partially clothed and bound bodies of three women, all of whom had been shot, were discovered on the Mexico City-Acapulco highway near Cuernavaca, the Morelos Attorney General's Office said.
The body of a woman who had been shot in the head was found in the city of Tepoztlan, the AG's office said.
Seven women have been murdered in Morelos in the space of a week, officials said.
Two other women were murdered in Sinaloa, a state in northwestern Mexico.
The body of a woman who had been shot in the head was found at a motel, while the battered body of another woman was dumped on the Quila-Oso Viejo highway, police said.
The bodies of eight men, all of whom appear to be the victims of a settling of scores between rival drug gangs, were discovered in the western state of Michoacan, prosecutors said.
Five of the bodies were discovered in San Gregorio, a community outside the city of Venustiano Carranza, with four of the victims found in a burning SUV that had been reported stolen, the Michoacan Attorney General's Office said.
The fifth man was dismembered and his remains were dumped in several trash bags near the burning vehicle, the AG's office said.
Three other men were murdered about one kilometer (0.62 miles) from where the five bodies were found.
The victims have not been identified, the AG's office said.
The bodies of three men were found in Nezahualcoyotl, a city in Mexico state, and a message signed by the La Familia Michoacana drug cartel was left with the bodies, media reports said.
Three other people were murdered in separate incidents in the area, unconfirmed media reports said.
The bullet-riddled bodies of two men were found in the city of Ecatepec, Mexico state Attorney General's Office spokesmen told Efe.
Mexico state surrounds the Federal District and forms part of the Mexico City metropolitan area.
More than 50,000 people, according to official figures, have died in drug-related violence in Mexico since late 2006.
The Movement for Peace with Justice and Dignity, which was founded by human rights activist and poet Javier Sicilia, puts the death toll from Mexico's drug war at 70,000. EFE