Many of the bodies were bound or gagged. Some showed signs of torture, according to a federal prosecutor who spoke Monday on condition of anonymity because he is not authorised to talk to the news media.
The graves are in La Barca near the border between Jalisco and Michoacan states, in a remote area by Lake Chapala, which is popular among tourists and American retirees. The region has become the site of a turf war between the Knights Templar and the New Generation cartels. Agents were led to the 22 mass graves by local police officers who confessed to working with a drug cartel.
The missing detectives have not been located nor have their bodies appeared in the graves. Some of the bodies appear to have been buried a year or more.
Meanwhile, in the north-central state of Zacatecas, officials reported Monday that they had found the bodies of two women hung from a pedestrian bridge in the city of Fresnillo.