Mexican officials said on Friday they found over 105 unidentified bodies dumped in a mass grave by Mexican security forces.
The investigation has been launched about some of suspicious officials across the country.
The state prosecutor Javier Perez announced the unidentified bodies of victims of violent crime were found in the state of Morelos, which is the second-smallest state in the nation, has one of highest kidnapping case rates in Mexico.
The officials are being investigated for neglect of duty and contravene the law on the burial of cadavers, the prosecutor's office said.
It is still not known that how many officials are been indicted.
Police found the victims' bodies in plastic bags and some of them in a bottle that had a case number from police investigations, said an official from the state human rights commission who suggested anonymity owing to preventing leak information to media.
"They were all together in one giant pit," the official said.
The mass grave was found after a search by one of the victim’s families. The victim was abducted and killed in 2013 and his body was identified after DNA tests.
Pena Nieto’s government came into office in 2012 after promising to restore order in the country where thousands of people have died in murders related to organised crime in eight years.
According to the latest official figures released by the Mexican Government, at least 25,000 people went missing in Mexico in the eight-year period between 2007 and 2015.