Soldiers guard the site where a tunnel, connected to the Altiplano Federal Penitentiary and used by drug lord Joaquin 'El Chapo' Guzman to escape, was located in Almoloya de Juarez, on the outskirts of Mexico City, July 12, 2015. REUTERS/Tomas Bravo

MEXICO CITY (Reuters) - Four public officials have been charged for their suspected roles in the jailbreak of Mexican drug lord Joaquin “El Chapo” Guzman, the country’s federal courts system said on Monday, bringing the total number of officials charged in his escape to seven.

Guzman broke out of a maximum-security prison in central Mexico in July, escaping in a tunnel built right into his cell. The incident was a humiliating blow to Mexican President Enrique Pena Nieto.

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, the federal courts board said in a statement.

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.

Three other officials were previously charged in Guzman’s escape. Last month, the acting head of the U.S. Drug Enforcement Administration said he thought Guzman was still in Mexico, adding he was “not terribly surprised” to find out he had broken out of prison.

Guzman also escaped from prison in 2001 and was only recaptured last year.