Mexican officials have begun exhuming the remains of more than 100 unidentified people buried by authorities in a common grave in the central state of Morelos.

State prosecutors said Monday in a statement that the exhumations began after noon in the Las Cruces site in Cuautla township.

Shoddy practices at the gravesite came to light last year after a judge ordered the state prosecutor's office to exhume a body and turn it over to family members. They found they had to dig around dozens of plastic-wrapped bodies in unmarked graves to reach it.

Genetic samples will be taken from each set of remains to attempt identification. They will be reburied in marked graves.

State prosecutor Javier Perez Duron says the investigation into how the unidentified remains were buried is underway.