Mexico City ? Investigators said Saturday they have found 51 corpses in two days of digging in a field near a trash dump outside the northern city of Monterrey, as excavations continued at one of the largest clandestine body dumping grounds in Mexico’s bloody drug war.

The attorney general of Nuevo Leon state, where Monterrey is, said the victims included 48 men and three women. There were so many bodies that authorities were using refrigerated trucks to hold them, Alejandro Garza y Garza told local television.

Investigators are still struggling to identify the remains but suspect drug traffickers are involved.