A view of an opening in a tunnel connected to the Altiplano Federal Penitentiary and used by drug lord Joaquin 'El Chapo' Guzman to escape, in Almoloya de Juarez, on the outskirts of Mexico City, July 14, 2015. Reuters/Edgard Garrido

(Reuters) - Mexico has arrested 13 more people in connection with the escape of drug lord Joaquin "El Chapo" Guzman, including the former director of the high-security prison he escaped from and a government official who oversaw Mexico's prisons.

A total of 20 officials have now been arrested in connection with Guzman's escape from a maximum-security prison in central Mexico in July.

Valentin Cardenas, the former director of the Altiplano prison in central Mexico, and Celina Oseguera, former director of Mexico's federal prisons, were arrested along with 11 prison guards, a person familiar with the arrests said on Friday.

Mexico's attorney general's office said in a press release that 13 people were arrested in connection with Guzman's escape but it did not give details.

Both Oseguera and Cardenas were removed from their positions shortly after Guzman escaped.

Four officials, including two members of Mexico's intelligence agency CISEN, were charged this month for their suspected roles in Guzman's jailbreak.

The drug lord escaped through a tunnel built into his cell.

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