At least five corpses have been recovered so far from the grave in Tlalmanalco, Mexico City prosecutor Rodolfo Rios told Radio 88.9, and he said officials would run DNA tests to determine their identities. "There are more bodies, but it's a difficult recovery operation because of the terrain," he added.
Authorities say they found the bodies in an area near Rancho La Mesa Ecological Park in the state of Mexico.
Officials have spent almost three months searching for the young bar-goers who vanished from the after-hours Heaven club at midday on May 26, just a block from Mexico's leafy Paseo de Reforma, the city's equivalent of the Champs-Elysees.
Prosecutors say the abductions are linked to a dispute between two rival drug gangs, one in Mexico City's dangerous Tepito neighbourhood, home to most of the abducted. The families of the disappeared, however, say they were not involved in drug trafficking.
The cameras showed most of the 12 getting into cars outside and being taken away.
They have not been heard from since.
So far, six people have been arrested in the Heaven case, including club owner Ernesto Espinosa Lobo, known as "The Wolf," who has been charged with kidnapping. Among the arrested are another bar owner, a driver and security guard. One suspect is still a fugitive.
A mass abduction of 12 mirrors crimes in drug-trafficking hot spots such as the western state of Michoacan, where 21 tourists disappeared, only to be found in a mass grave, or in Monterrey, where 17 kidnapped musicians were found dead in the bottom of a well.
