(CNSNews.com)- Attorney General Arturo Gonzales of Mexico's Chihuhua state conceded Friday that state and Mexican federal police may have been involved in killing 200 people, who disappeared from the northern Mexican city of Juarez, across the border from El Paso, Texas, over the past decade.
Gonzales held a news conference outside a ranch where the joint US-Mexican investigating team uncovered a grave containing six people. Gonzales also said that, although it was possible that state and federal agents were responsible for some of the deaths, he insisted that his officers were not involved in the investigation because it was outside of their jurisdiction.
Four sites near Juarez still are being searched by a team of FBI agents and Mexican federal investigators for a series of mass graves that are believed to hold dozens of victims of the northern Mexican region's most powerful drug cartel. Mexican army troops are guarding the sites while the investigation proceeds.
Uncovered remains, thus far, are being taken to El Paso for identification.
The joint investigation by the FBI, American forensic scientists and the Mexican Army and police began Monday, reportedly on a tip from a former Mexican police officer who worked for the drug traffickers while in uniform.
Juarez has been known as the headquarters of the Juarez Cartel, a drug trafficking gang that was headed by Amado Carrillo Fuentes. He died in 1997 after plastic surgery. Fuentes had a reputation of being Mexico's most infamous cocaine trafficker.