Felipe Calderon, Mexico's president, has vowed not to back down in his war on drug gangs, in the face of spiralling violence.
In the latest developments, 14 bodies were found in different locations across the resort town of Acapulco.
Elsewhere in the north, a police officer investigating the mass killings of 72 migrants was found dead, and a senior prosecutor on the case also went missing.
In Tamaulipas state, the scene of that massacre, several car bombs exploded.
Al Jazeera's Mariana Sanchez reports on the violence from the Mexican city of Reynosa.
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