Felipe Calderon, Mexico's president, has vowed not to back down in his war on drug gangs, in the face of spiralling violence - that his security forces appear powerless to stop.
In the latest developments, 14 bodies have been 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 from Mexican city of Reynosa.