A military tank guards the entrance of the prison in which he was held back kingpin Joaquin "El Chapo" Guzman.
Before he can be extradited to the United States, Mexican authorities want to eliminate any risk of a new leak, as the spectacular escape that "El Chapo" starred last July 11, becoming the first underground escape from this prison .
"Everything necessary to prevent further leakage is made," he told AFP a federal official, who requested anonymity.
In the past six months in prison they made improvements in access filters, camera operation, perimeter security, monitoring command centers and conditions of detention of prisoners, the National Security Committee said.
Similarly, the floor in a cell was reinforced with metal rods to prevent re-run through a tunnel about six months ago, authorities said.
Many were stunned by the return of Guzman, detailed text.
Risk of death
The blow to the image of the Mexican government was such that the authorities say "should send the message that this criminal had to re-enter the prison where he escaped, and that there continues to guarantee to save the world's most wanted man" He said a national security expert, Gerardo Rodriguez.
However, now more worrying is that not escape, but "it can kill," said his side MANAUT Raul Benitez, a researcher at the National Autonomous University of Mexico.
"His murder could be motivated by the fear that if extradited to talk and engage narco" said MANAUT.
Causes of leakage
A dozen policemen and guards were arrested after the recent escape of Guzman and the prison director and former coordinator of federal penitentiaries.
Notably, in 2001, "El Chapo" had already escaped in a laundry van in another Mexican prison.
Experts agree that the government must act quickly this time to send the kingpin to the United States.
The Altiplano was built between 1988 and 1990 with walls a meter thick, restricted airspace and underground sensors, among other security measures.
Before fleeing, Guzman shared closure in the same prison with several capos as Edgar Valdez alias "La Barbie," one of the former leaders of the Beltran Leyva cartel, and the last leader of the criminal Dynasty, alias Hector Beltran Leyva " The H ", among others.