Mexican security forces scrambled Monday to save face and recapture drug kingpin Joaquin "El Chapo" Guzman as authorities investigated whether guards helped him escape prison through a tunnel under his cell.
For the second time in 14 years the head of the powerful Sinaloa drug cartel managed to flee a maximum-security prison, dealing an embarrassing setback to President Enrique Pena Nieto.
Troops and police were deployed to hunt down Guzman after he vanished late Saturday from the Altiplano prison 90 kilometers (55 miles) west of Mexico City, after just 17 months behind bars.
Prosecutors questioned 30 prison employees of various rank, including the warden, who spent the night at the anti-organized crime unit of the attorney general`s office.
The guards in charge of the capo`s cell and those who monitored the surveillance cameras that look into the room were among those interrogated, said an official in the attorney general`s office.
"They are making statements, with the assistance of lawyers and human rights personnel," the official told on condition of anonymity, adding that no charges have been filed so far.
Guzman`s lawyers and anybody else who visited him during his incarceration are also being sought for questioning, the official said.
Authorities had already investigated a strange prison visit to Guzman in March when a woman managed to see him by using a fake ID to enter the jail.
On a state visit to Paris, Pena Nieto said Guzman`s escape was "an affront to the state" and demanded an investigation into whether prison guards helped him.
Guzman, 58, who nurtured a Robin Hood image in his northwestern state of Sinaloa while running the most powerful and one of the most ruthless cartels in Mexico, was able to slip out even though surveillance cameras were trained on his cell.
He went into his private shower and after he failed to come out guards found a hole 10 meters (33 feet) deep with a ladder in it.
The gap led to a 1.5-kilometer tunnel with a ventilation and light system, ending inside a gray brick building on a hill surrounded by pastures in central Mexico State.
A huge water pipeline project is under construction around the prison, which could explain why the tunnel`s construction went unnoticed.As investigators tried to figure out how Guzman busted out again, police and troops manned checkpoints and searched cars and trucks on nearby roads.
Mike Vigil, a retired US Drug Enforcement Administration (DEA) international operations chief, warned that if Guzman is not captured in the next day or so he will vanish for good.
"If he is able to make his way to Sinaloa, his native state, and gets into that mountainous range, it`s going to be very difficult to capture him because he enjoys the protection of local villagers," Vigil told AFP.
Several states, including Sinaloa, set up checkpoints. Central Puebla state said it was using X-ray technology at toll booths to see through cars.
Security forces in Central American nations were placed on high alert at their borders. It was in Guatemala that Guzman was first arrested in 1993.
Guzman`s first escape was in 2001, when he slipped past authorities by hiding in a laundry cart in western Jalisco state.
Marines recaptured him in February 2014 in a pre-dawn raid in a condo in Mazatlan, a Pacific resort in Sinaloa state, with the DEA`s help.The government has won praise for capturing a slew of kingpins and Guzman, a diminutive but feared man whose nickname means "Shorty," was the president`s biggest trophy.
US Attorney General Loretta Lynch said she shared Mexico`s "concern" and offered help for his "swift recapture."
Some US prosecutors wanted to ask for his extradition following last year`s arrest, but Mexican officials insisted on trying him first.
"This leads to a big problem with the US government because they asked (for an extradition) and the Mexican government did not deliver him, claiming that he could be held in one of the country`s maximum-security prisons," said Raul Benitez Manaut, security expert at the National Autonomous University of Mexico.