Five severed heads were found in bags in a wooden crate near an elementary school in Acapulco on Tuesday, Mexican police said.
The heads were reportedly accompanied by notes threatening three local drug traffickers.
All five heads appeared to be of men, authorities said. Five headless bodies were discovered near a burned-out vehicle on Monday, but it is not clear if the two incidents are connected.
The gruesome incident may be connected to threats received by teachers at nearly 140 elementary schools in Acapulco last month.
Educators went on strike at the beginning of the school year after they received threats from drug cartels demanding money, CNN reported. The threats stated that schools that refused to pay the kickbacks would be attacked.
Drug gangs have resorted to targeting schools in the wake of a government crackdown on their activities. Brutal murders and extortion have become common in Acapulco as the drug cartels fight for control.SOURCE