A fourth person's remains were found nearby yesterday along with a hand-lettered sign containing an apparent reference to a drug gang.
The security spokesman for the southern state of Guerrero said the detectives' bodies had been covered with logs and set afire. Their weapons were also burned.
Their vehicle was found on the outskirts of Zihuatanejo in an area not frequented by tourists.
Spokesman Roberto Alvarez said the agents were reported missing on Thursday.
The area has been the scene of increasing violence in recent months.
Disclaimer: No Business Standard Journalist was involved in creation of this content