A court in Mexico formally charged four criminal justice workers for their alleged role in the July prison escape of drug kingpin Joaquin "El Chapo" Guzman, AFP reports.

A federal judge in the central state of Toluca said the four security workers failed to follow "protocols and norms" and did not notify higher-ups about the jailbreak in a timely way.

Two of the men charged were prison employees tasked with video monitoring of El Chapo's cell. The other two worked for the Mexican intelligence service.