Thirteen suspected organized-crime enforcers were killed over the weekend in separate clashes with Mexican police and soldiers, officials said.
A battle Saturday in the central town of Genaro Codina left eight suspects dead, Zacatecas state Attorney General Arturo Nahle Garcia, identifying the fatalities only as seven men and a 24-year-old woman.
All eight had criminal records, he said.
Five other people were arrested by federal police, who also seized weapons, ammunition, vehicles and communications equipment, Nahle said.
Five suspects were killed Sunday in a shootout with army troops in Ciudad Victoria, capital of the northern border state of Tamaulipas.
The suspects, who were traveling in an SUV, initiated the confrontation, the state AG's office said in a statement.
Conflict among rival drug cartels and between criminals and the security forces has claimed some 60,000 lives in Mexico since December 2006, when then-President Felipe Calderon gave the military the leading role in the struggle against the drug trade. EFE