The tortured and bound bodies of seven men were dumped in a Pacific port city along with messages signed by a drug gang, authorities said Thursday.
The Michoacan state prosecutors' office said each victim's head was covered with a black plastic bag and had a bullet wound in the back of the neck. Police found posters with threatening messages from the New Generation gang, an ally of Mexico's powerful Sinaloa Cartel.
The killings in the port of Lazaro Cardenas came only two days after nine bodies were found in other Michoacan towns, also with messages signed by New Generation.
Authorities also reported that the bodies of five more men were discovered shot dead Thursday in other areas of Michoacan, but it wasn't clear who was responsible.
In the northern Mexico state of Tamaulipas, four men and a woman were decapitated and their bodies left in plain sight Thursday in a poor neighborhood of Ciudad Victoria, witnesses said. A fifth man was shot.
An Associated Press reporter saw police and soldiers arrive at the scene and carry away the wounded victim and the bodies and heads.
Mexico's drug cartels often leave decapitated victims out in the open to intimidate gangs warring for dominance in trafficking narcotics.