Mexico has filed charges against the alleged leader of a ruthless cell of the Zetas drug cartel who authorities say masterminded the mass killings of more than 250 people in a northern border state.
The federal Attorney General's Office says Martin Estrada Luna is charged with organized crime, kidnapping, drug trafficking and illegal possession of firearms.
Prosecutors said after Estrada Luna's April arrest that he was responsible for the slayings of 72 migrants last August and 183 people months later in Tamaulipas state, but he has not been charged with the killings.
The 34-year-old high school dropout was born in Mexico and grew up in the U.S., where he had a rap sheet of petty crimes. He was deported to Mexico in 2009.