Four public Mexican officials have been charged for their suspected roles in the jailbreak of Mexican drug lord Joaquin "El Chapo Guzman. This brings the total number of officials charged in his escape to seven.

The federal courts board said in a statement that two members of Mexico's intelligence agency, CISEN, and two guards at the Altiplano prison from where Guzman escaped, have been charged with helping a prisoner escape.

According to the charges, the four officials did not activate mechanisms to alert others of Guzman's escape, despite the fact all the technological systems needed to do so were working normally. Guzman broke out of a maximum-security prison in central Mexico in July, escaping in a tunnel built right into his cell.