An inmate with a tattoo of Santa Muerte (The Saint of Death) reacts in the Topo Chico prison, during a media tour, in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

A female inmate hangs clothes in the Topo Chico prison, during a media tour, in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

Inmates are seen in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

Inmates are seen in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

A woman embraces her relative who is an inmate as she visits him in the Topo Chico prison, during a media tour, in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

Family members visit inmates in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

One of the three men that Democratic Forces of Syria fighters claimed were Islamic State fighters gestures while being held as a prisoner with fellow fighters near al-Shadadi town, Hasaka countryside, Syria, February 18, 2016. REUTERS/Rodi Said TPX IMAGES OF THE DAY TPX IMAGES OF THE DAY

Windows burned in a riot are seen in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

A inmate walks holding a table in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

A female inmate is seen inside her cell in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril TPX IMAGES OF THE DAY

A police officer stands guard next to a female inmate in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

Female inmates are seen outside their cells in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril

Inmates are seen in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril 

Inmates speak on phones at the Topo Chico prison during a media tour, in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril TPX IMAGES OF THE DAY

Inmates talk inside their cell in the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril 

Inmates, outside their cells, are seen reflected in mirrors at the Topo Chico prison during a media tour in Monterrey February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril 

Inmates are seen inside the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril 

Inmates are seen inside the Topo Chico prison during a media tour in Monterrey, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril 

Inmates are seen inside in the Topo Chico prison in Monterrey during a media tour, Mexico, February 17, 2016. The director of the prison in northeast Mexico where 49 people died in a riot which took place on February 11, 2016, was accused of murder and detained, along with two others, a state prosecutor said on Saturday. Picture taken February 17. REUTERS/Daniel Becerril 

Pope Francis visits the CeReSo n. 3 penitentiary in Ciudad Juarez February 17, 2016. REUTERS/Gabriel Bouys/Pool

Pope Francis is greeted by a female inmate during his visit to the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico on February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis visits the the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis is greeted by a female inmate during his visit to the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico on February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis visits the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis visits the the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis visits the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis is greeted by a female inmate during his visit to the CeReSo n. 3 penitentiary in Ciudad Juarez February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis visits the the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis visits the the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis is greeted by a female inmate during his visit to the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis is greeted by a female inmate during his visit to the CeReSo n.3 penitentiary in Ciudad Juarez, Mexico, February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Inmates look on during the visit of Pope Francis to the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Pope Francis receives a cross made by an inmate during his visit to the CeReSo n. 3 penitentiary in Ciudad Juarez, Mexico February 17, 2016. REUTERS/Gabriel Buoys/Pool 

Suspects of last year's Bangkok blast Bilal Mohammed (front) (also known as Adem Karadag) and Yusufu Mieraili are escorted by prison officers as they arrive at the military court in Bangkok, Thailand, February 16, 2016. REUTERS/Chaiwat Subprasom

Suspect of last year's Bangkok blast Bilal Mohammed (also known as Adem Karadag) is escorted by prison officers as he arrives at the military court in Bangkok, Thailand, February 16, 2016. REUTERS/Chaiwat Subprasom

Suspect of last year's Bangkok blast Bilal Mohammed (also known as Adem Karadag) is escorted by prison officers as he arrives at the military court in Bangkok, Thailand, February 16, 2016. REUTERS/Chaiwat Subprasom

Suspects of last year's Bangkok blast Bilal Mohammed (C) (also known as Adem Karadag) and Yusufu Mieraili are escorted by prison officers as they arrive at the military court in Bangkok, Thailand, February 16, 2016. REUTERS/Chaiwat Subprasom TPX IMAGES OF THE DAY

Former Israeli Prime Minister Ehud Olmert (2nd R) enters Maasiyahu prison near Ramle, south of Tel Aviv, Israel February 15, 2016. Olmert begins his 19-month prison sentence on Monday, making him the first former head of government in Israel to go to prison. REUTERS/Nir Elias

Former Israeli Prime Minister Ehud Olmert (L) enters Maasiyahu prison near Ramle, south of Tel Aviv, Israel February 15, 2016. Olmert begins his 19-month prison sentence on Monday, making him the first former head of government in Israel to go to prison. REUTERS/Nir Elias

Former Israeli Prime Minister Ehud Olmert (C) enters Maasiyahu prison near Ramle, south of Tel Aviv, Israel February 15, 2016. Olmert begins his 19-month prison sentence on Monday, making him the first former head of government in Israel to go to prison. REUTERS/Nir Elias TPX IMAGES OF THE DAY

New York City Police officer (NYPD) Peter Liang reacts as the verdict is read during his trial in court room at the Brooklyn Supreme court in the Brooklyn borough of New York February 11, 2016. Liang was convicted of manslaughter and official misconduct on Thursday for fatally shooting an unarmed black man, Akai Gurley, in a darkened public housing stairwell in 2014, according to media reports. REUTERS/Mary Altaffer/Pool TPX IMAGES OF THE DAY

New York City Police officer (NYPD) Peter Liang is led from the court room at the Brooklyn Supreme court in the Brooklyn borough of New York February 11, 2016. Liang was convicted of manslaughter and official misconduct on Thursday for fatally shooting an unarmed black man in a darkened public housing stairwell in 2014, according to media reports. REUTERS/Brendan McDermid TPX IMAGES OF THE DAY

Inmates look from a staircase at the Topo Chico prison in Monterrey, Mexico, February 11, 2016. REUTERS/Daniel Becerril 

An inmate's family member is being looked after by a Green Cross worker outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. REUTERS/Daniel Becerril

Inmates' family members shade themselves from the sun while standing outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. REUTERS/Daniel Becerril

An inmate's family member is being looked after by Green Cross workers outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. REUTERS/Daniel Becerril

An inmate's family member waves to inmates while hanging on to the fence surrounding the Topo Chico prison in Monterrey, Mexico, February 11, 2016. REUTERS/Daniel Becerril

Soldiers stand guard near the Topo Chico prison in Monterrey, Mexico, February 11, 2016. REUTERS/Daniel Becerril 

Soldiers walk near the Topo Chico prison in Monterrey, Mexico, February 11, 2016. REUTERS/Daniel Becerril

A family member of an inmate reacts while standing with others outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. REUTERS/Daniel Becerril

People help a woman who fainted while standing with family members of inmates outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril 

Family members of inmates gather outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril 

People help a woman who fainted while standing with family members of inmates outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril 

Family members of inmates read a list with the names of inmates who died in a riot at the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril 

A police officer walks on a vehicle parked at the entrance of the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril

Family members of inmates clash with police blocking the entrance of the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril

A man kicks a police shield as he and other family members of inmates clash with police blocking the entrance of the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril

Family members of inmates clash with police blocking the entrance of the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril

A police helicopter flies over the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril

Family members of inmates react as police block the entrance to the Topo Chico prison in Monterrey, Mexico, February 11, 2016. A battle between rival drug gangs at a prison killed 52 people in the northeastern Mexican city of Monterrey, authorities said on Thursday, days ahead of a planned visit by Pope Francis to another jail in Mexico's far north. REUTERS/Daniel Becerril