The victims were holding a party at their house at the time of the attack, which also left five adults and two children wounded. It was reportedly a birthday party.
The boy’s name was not released, but his nickname — "Little Chapo" — is an apparent reference to imprisoned drug lord Joaquin "El Chapo" Guzman.
BRITISH MEN SENTENCED FOR DRUNKEN INTERFERENCE ABOARD FLIGHT DIVERTED TO MAINE
A 14-year-old boy was arrested in Mexico for the drug-related murder of eight people. (Fox News)
The motive in the killings has not been made public, but drug gangs in Mexico frequently dabble in kidnapping and contract killing. They also kill rivals selling drugs on their territory, or people who owe them money.
Mexico is no stranger to child killers.
In 2010, soldiers detained a 14-year-old boy nicknamed "El Ponchis." The boy claimed he was kidnapped at the age of 11 and forced to work for the Cartel of the South Pacific, a branch of the splintered Beltran Leyva gang, and that he had participated in at least four decapitations.
After his arrest, the boy — who authorities identified only by his first name, Edgar — told reporters that he was drugged and threatened into committing the crimes.