Mexican prosecutors accuse Mr Salas of being the man tasked with guarding Joaquin Guzman, the fugitive leader of the Sinaloa cartel.

BBC: Shorty Guzman's 'security chief' arrested in Mexico

Joaquin Guzman, known as "El Chapo", or "Shorty", was arrested in 1993.

BBC: Shorty Guzman's 'security chief' arrested in Mexico

But their control over this territory is now said to be facing a challenge from their former allies, the Gulf Cartel, in an alliance with the Sinaloa cartel led by Joaquin Guzman, Mexico's most wanted man.

BBC: Seventeen partygoers shot dead in Mexico

The Mexican military says it has captured the man accused of being the security chief for Joaquin "Shorty" Guzman, Mexico's most wanted drug lord.

BBC: Shorty Guzman's 'security chief' arrested in Mexico

Police in Mexico have arrested the father-in-law of the country's most wanted man, the drug boss Joaquin 'El Chapo' Guzman.

BBC: Mexico arrests Joaquin 'El Chapo' Guzman's father-in-law