Mexican authorities have detained employees of the old and overcrowded Topo Chico prison in Monterrey, following the 11 February riot which resulted in the deaths of 52 people. Roberto Flores, the state prosecutor in Nuevo Leon has since accused prison director Gregoria Salazar, prison guard Jose Reyes Hernandez and the deputy superintendent Jesus Fernando Dominguez of homicide and abuse of authority and has placed them preventive custody.

The riot happened after fighting broke out between supporters of Zeta 27 gang leader, Juan Pedro Saldivar-Farías , who have effectively taken control of the prison, and Jorge Iván Hernández, "El Credo", a leader of another group, Gulf Cartel. It was not immediately clear how the victims died with reports stating that there was no gunfire.

The prison has long housed members of Zeta 27, who have spread fear across Mexico before being debilitated by arrests and the deaths of their founding members. The gang was also linked to another prison murder in Nuevo Leon in 2012, when 44 inmates died after Zeta members plotted with guards to stage an elaborate escape.

Reuters photographer Daniel Becarril visited Topo Chico prison a week after the incident, witnessing the aftermath of what has been described as the deadliest riot in Mexico's history.

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Inmates are seen inside in the Topo Chico prison in MonterreyDaniel Becerril/ Reuters
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A inmate walks holding a table in the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters
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Inmates talk inside their cell in the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters
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An inmate with a tattoo of Santa Muerte (The Saint of Death) reacts in the Topo Chico prisonDaniel Becerril/ Reuters
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Inmates are seen in the Topo Chico prison during a media tour in MonterreyDaniel Becerril/ Reuters
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Inmates speak on phones at the Topo Chico prisonDaniel Becerril/ Reuters
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Inmates are seen inside the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters
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A female inmate hangs clothes in the Topo Chico prison, during a media tour, in Monterrey, MexicoDaniel Becarril/ Reuters
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Clothes of female inmates hang against a wall inside in the Topo Chico prison in Monterrey, MexicoDaniel Becerril/ Reuters
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Inmates are seen in the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters
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Inmates are seen in the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters
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Female inmates are seen outside their cells in the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters
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An inmate sells cigarettes in the Topo Chico prisonDaniel Becerril/ Reuters
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Inmates gesture gang signs in the Topo Chico prison, during a media tour, in Monterrey, MexicoDaniel Becerril/ Reuters
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Inmates are seen inside the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters
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The burnt out prison cell is seen after a riot at the Topo Chico prison in MonterreyDaniel Becerril/ Reuters
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Windows burned in a riot are seen in the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters
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Television sets, images of the Saint of Death and other things are piled up in the patio after a riot at the Topo Chico prisonDaniel Becerril/ Reuters
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A police officer stands guard next to a female inmate in the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters
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Inmates clean a cell after the riot at the Topo Chico prisonDaniel Becerril/ Reuters
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A female inmate is seen inside her cell in the Topo Chico prisonDaniel Becerril/ Reuters
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Inmates are seen reflected in mirrors at the Topo Chico prison during a media tour in MonterreyDaniel Becerril/ Reuters
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Mattresses and other things are piled up in the patio after a riot at the Topo Chico prison in Monterrey, MexicoDaniel Becarril/ Reuters
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An area used by inmates as a bar is seen after a riot at the Topo Chico prison in Monterrey, MexicoDaniel Becarril/ Reuters
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Family members visit inmates in the Topo Chico prison during a media tour in Monterrey, MexicoDaniel Becerril/ Reuters